Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details)

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FAIR VALUE MEASUREMENTS (Carrying Values and Estimated Fair Values of the Company's Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
ASSETS    
Cash and cash equivalents $ 802,501 $ 493,294
Securities available for sale, at fair value 3,481,650 2,540,419
HTM securities 693,774 619,765
Restricted stock 76,825 94,782
Loans held for sale, at fair value 20,861 96,742
Net loans 12,861,274 13,710,640
Derivatives:    
Accrued interest receivable 65,015 75,757
Bank owned life insurance 431,517 326,892
LIABILITIES    
Deposits 16,630,087 15,763,991
Borrowings 488,796 821,516
Accrued interest payable 933 2,516
Derivatives:    
Fair value hedges 5,387 12,483
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 802,501 493,294
Securities available for sale, at fair value 64,474 0
HTM securities 0 0
Restricted stock 0 0
Loans held for sale, at fair value 0 0
Net loans 0 0
Derivatives:    
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Derivatives:    
Fair value hedges 0 0
Significant Other Observable Inputs Level 2    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 3,417,176 2,540,419
HTM securities 686,733 606,496
Restricted stock 76,825 94,782
Loans held for sale, at fair value 20,861 96,742
Net loans 0 0
Derivatives:    
Accrued interest receivable 65,015 75,757
Bank owned life insurance 431,517 326,892
LIABILITIES    
Deposits 16,630,087 15,763,991
Borrowings 488,796 821,516
Accrued interest payable 933 2,516
Derivatives:    
Fair value hedges 5,387 12,483
Significant Unobservable Inputs Level 3    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 0 0
HTM securities 7,041 13,269
Restricted stock 0 0
Loans held for sale, at fair value 0 0
Net loans 12,861,274 13,710,640
Derivatives:    
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Derivatives:    
Fair value hedges 0 0
Interest Rate Swap    
Derivatives:    
Interest rate swap 73,696 163,360
Derivatives:    
Interest rate swap 49,051 163,360
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets Level 1    
Derivatives:    
Interest rate swap 0 0
Derivatives:    
Interest rate swap 0 0
Interest Rate Swap | Significant Other Observable Inputs Level 2    
Derivatives:    
Interest rate swap 73,696 163,360
Derivatives:    
Interest rate swap 49,051 163,360
Interest Rate Swap | Significant Unobservable Inputs Level 3    
Derivatives:    
Interest rate swap 0 0
Derivatives:    
Interest rate swap 0 0
Carrying Value    
ASSETS    
Cash and cash equivalents 802,501 493,294
Securities available for sale, at fair value 3,481,650 2,540,419
HTM securities 628,000 544,851
Restricted stock 76,825 94,782
Loans held for sale, at fair value 20,861 96,742
Net loans 13,096,056 13,860,774
Derivatives:    
Accrued interest receivable 65,015 75,757
Bank owned life insurance 431,517 326,892
LIABILITIES    
Deposits 16,611,068 15,722,765
Borrowings 506,594 840,717
Accrued interest payable 933 2,516
Derivatives:    
Fair value hedges 5,387 12,483
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate swap 73,696 163,360
Derivatives:    
Interest rate swap $ 49,051 $ 163,360