Quarterly report pursuant to Section 13 or 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
Mar. 31, 2021
Dec. 31, 2020
ASSETS    
Cash and cash equivalents $ 400,880 $ 493,294
Securities available for sale, at fair value 2,697,043 2,540,419
HTM securities 606,359 619,765
Restricted stock 76,824 94,782
Loans held for sale, at fair value 49,082 96,742
Net loans 13,950,754 13,710,640
Derivatives:    
Fair value hedges 2,139  
Accrued interest receivable 74,603 75,757
Bank owned life insurance 328,627 326,892
LIABILITIES    
Deposits 16,328,962 15,763,991
Borrowings 538,488 821,516
Accrued interest payable 3,561 2,516
Derivatives:    
Cash flow hedges 1,808  
Fair value hedges 7,949 12,483
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 400,880 493,294
Securities available for sale, at fair value 0 0
HTM securities 0 0
Restricted stock 0 0
Loans held for sale, at fair value 0 0
Net loans 0 0
Derivatives:    
Fair value hedges 0  
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Derivatives:    
Cash flow hedges 0  
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 2,697,043 2,540,419
HTM securities 593,589 606,496
Restricted stock 76,824 94,782
Loans held for sale, at fair value 49,082 96,742
Net loans 0 0
Derivatives:    
Fair value hedges 2,139  
Accrued interest receivable 74,603 75,757
Bank owned life insurance 328,627 326,892
LIABILITIES    
Deposits 16,328,962 15,763,991
Borrowings 538,488 821,516
Accrued interest payable 3,561 2,516
Derivatives:    
Cash flow hedges 1,808  
Fair value hedges 7,949 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 12,770 13,269
Restricted stock 0 0
Loans held for sale, at fair value 0 0
Net loans 13,950,754 13,710,640
Derivatives:    
Fair value hedges 0  
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Derivatives:    
Cash flow hedges 0  
Fair value hedges 0 0
Interest Rate Swap    
Derivatives:    
Interest rate swap 106,450 163,360
Derivatives:    
Interest rate swap 106,450 163,360
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 106,450 163,360
Derivatives:    
Interest rate swap 106,450 163,360
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 400,880 493,294
Securities available for sale, at fair value 2,697,043 2,540,419
HTM securities 543,575 544,851
Restricted stock 76,824 94,782
Loans held for sale, at fair value 49,082 96,742
Net loans 14,129,369 13,860,774
Derivatives:    
Fair value hedges 2,139  
Accrued interest receivable 74,603 75,757
Bank owned life insurance 328,627 326,892
LIABILITIES    
Deposits 16,298,017 15,722,765
Borrowings 563,600 840,717
Accrued interest payable 3,561 2,516
Derivatives:    
Cash flow hedges 1,808  
Fair value hedges 7,949 12,483
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate swap 106,450 163,360
Derivatives:    
Interest rate swap $ 106,450 $ 163,360