Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details)

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FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
ASSETS    
Securities available for sale, at fair value $ 3,481,650 $ 2,540,419
Loans held for sale, at fair value 20,861 96,742
LIABILITIES    
Fair value hedges 5,387 12,483
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 64,474 0
Loans held for sale, at fair value 0 0
LIABILITIES    
Fair value hedges 0 0
Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 3,417,176 2,540,419
Loans held for sale, at fair value 20,861 96,742
LIABILITIES    
Fair value hedges 5,387 12,483
Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Loans held for sale, at fair value 0 0
LIABILITIES    
Fair value hedges 0 0
Recurring    
ASSETS    
Loans held for sale, at fair value 20,861 96,742
Interest rate swap 73,696 163,360
LIABILITIES    
Interest rate swap 49,051 163,360
Fair value hedges 5,387 12,483
Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Loans held for sale, at fair value 0 0
Interest rate swap 0 0
LIABILITIES    
Interest rate swap 0 0
Fair value hedges 0 0
Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Loans held for sale, at fair value 20,861 96,742
Interest rate swap 73,696 163,360
LIABILITIES    
Interest rate swap 49,051 163,360
Fair value hedges 5,387 12,483
Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Loans held for sale, at fair value 0 0
Interest rate swap 0 0
LIABILITIES    
Interest rate swap 0 0
Fair value hedges 0 0
U.S. government and agency securities    
ASSETS    
Securities available for sale, at fair value 73,849 13,394
U.S. government and agency securities | Recurring    
ASSETS    
Securities available for sale, at fair value 73,849 13,394
U.S. government and agency securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 64,474 0
U.S. government and agency securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 9,375 13,394
U.S. government and agency securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Obligations of states and political subdivisions    
ASSETS    
Securities available for sale, at fair value 1,008,396 837,326
Obligations of states and political subdivisions | Recurring    
ASSETS    
Securities available for sale, at fair value 1,008,396 837,326
Obligations of states and political subdivisions | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Obligations of states and political subdivisions | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 1,008,396 837,326
Obligations of states and political subdivisions | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Corporate and other bonds    
ASSETS    
Securities available for sale, at fair value 153,376 151,078
Corporate and other bonds | Recurring    
ASSETS    
Securities available for sale, at fair value 153,376 151,078
Corporate and other bonds | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Corporate and other bonds | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 153,376 151,078
Corporate and other bonds | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Mortgage-backed securities | Recurring    
ASSETS    
Securities available for sale, at fair value 2,244,389 1,536,996
Mortgage-backed securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Mortgage-backed securities | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 2,244,389 1,536,996
Mortgage-backed securities | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Other securities    
ASSETS    
Securities available for sale, at fair value 1,640 1,625
Other Debt Obligations | Recurring    
ASSETS    
Securities available for sale, at fair value 1,640 1,625
Other Debt Obligations | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Securities available for sale, at fair value 0 0
Other Debt Obligations | Recurring | Significant Other Observable Inputs Level 2    
ASSETS    
Securities available for sale, at fair value 1,640 1,625
Other Debt Obligations | Recurring | Significant Unobservable Inputs Level 3    
ASSETS    
Securities available for sale, at fair value 0 0
Interest Rate Swap    
ASSETS    
Interest rate swap 73,696 163,360
LIABILITIES    
Interest rate swap 49,051 163,360
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Interest rate swap 0 0
LIABILITIES    
Interest rate swap 0 0
Interest Rate Swap | Significant Other Observable Inputs Level 2    
ASSETS    
Interest rate swap 73,696 163,360
LIABILITIES    
Interest rate swap 49,051 163,360
Interest Rate Swap | Significant Unobservable Inputs Level 3    
ASSETS    
Interest rate swap 0 0
LIABILITIES    
Interest rate swap $ 0 $ 0