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, 2020
Dec. 31, 2019
ASSETS    
Cash and cash equivalents $ 504,959 $ 436,032
Securities available for sale, at fair value 1,972,903 1,945,445
HTM securities 604,780 603,503
Restricted stock 130,227 130,848
Loans held for sale, at fair value 76,690 55,405
Net loans 12,413,731 12,449,505
Derivatives:    
Fair value hedges 1 182
Accrued interest receivable 46,678 52,721
Bank owned life insurance 324,980 322,917
LIABILITIES    
Deposits 13,610,143 13,349,943
Borrowings 1,501,474 1,479,606
Accrued interest payable 7,532 6,108
Derivatives:    
Cash flow hedges   1,147
Fair value hedges 14,769 6,256
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 504,959 436,032
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 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 1,972,903 1,945,445
HTM securities 588,984 585,820
Restricted stock 130,227 130,848
Loans held for sale, at fair value 76,690 55,405
Net loans 0 0
Derivatives:    
Fair value hedges 1 182
Accrued interest receivable 46,678 52,721
Bank owned life insurance 324,980 322,917
LIABILITIES    
Deposits 13,610,143 13,349,943
Borrowings 1,501,474 1,479,606
Accrued interest payable 7,532 6,108
Derivatives:    
Cash flow hedges   1,147
Fair value hedges 14,769 6,256
Significant Unobservable Inputs Level 3    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 0 0
HTM securities 15,796 17,683
Restricted stock 0 0
Loans held for sale, at fair value 0 0
Net loans 12,413,731 12,449,505
Derivatives:    
Fair value hedges 0 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 174,704 54,345
Derivatives:    
Interest rate swap 174,704 54,345
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 174,704 54,345
Derivatives:    
Interest rate swap 174,704 54,345
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 504,959 436,032
Securities available for sale, at fair value 1,972,903 1,945,445
HTM securities 552,176 555,144
Restricted stock 130,227 130,848
Loans held for sale, at fair value 76,690 55,405
Net loans 12,627,798 12,568,642
Derivatives:    
Fair value hedges 1 182
Accrued interest receivable 46,678 52,721
Bank owned life insurance 324,980 322,917
LIABILITIES    
Deposits 13,553,035 13,304,981
Borrowings 1,514,464 1,513,748
Accrued interest payable 7,532 6,108
Derivatives:    
Cash flow hedges   1,147
Fair value hedges 14,769 6,256
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate swap 174,704 54,345
Derivatives:    
Interest rate swap $ 174,704 $ 54,345