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, 2019
Dec. 31, 2018
ASSETS    
Cash and cash equivalents $ 436,032 $ 261,199
Securities available for sale, at fair value 1,945,445 1,774,821
HTM securities 603,503 499,501
Restricted stock 130,848 124,602
Loans held for sale, at fair value 55,405  
Net loans 12,449,505 9,534,717
Derivatives:    
Fair value hedges 182 1,872
Accrued interest receivable 52,721 46,062
Bank owned life insurance 322,917 263,034
LIABILITIES    
Deposits 13,349,943 9,989,788
Borrowings 1,479,606 1,742,038
Accrued interest payable 6,108 5,284
Derivatives:    
Cash flow hedges 1,147 4,786
Fair value hedges 6,256 1,684
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 436,032 261,199
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  
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 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 1,945,445 1,774,821
HTM securities 585,820 499,501
Restricted stock 130,848 124,602
Loans held for sale, at fair value 55,405  
Net loans 0 0
Derivatives:    
Fair value hedges 182 1,872
Accrued interest receivable 52,721 46,062
Bank owned life insurance 322,917 263,034
LIABILITIES    
Deposits 13,349,943 9,989,788
Borrowings 1,479,606 1,742,038
Accrued interest payable 6,108 5,284
Derivatives:    
Cash flow hedges 1,147 4,786
Fair value hedges 6,256 1,684
Significant Unobservable Inputs Level 3    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 0 0
HTM securities 17,683 0
Restricted stock 0 0
Loans held for sale, at fair value 0  
Net loans 12,449,505 9,534,717
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 0
Fair value hedges 0 0
Interest Rate Swap    
Derivatives:    
Interest rate swap 54,345 19,426
Derivatives:    
Interest rate swap 54,345 19,426
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 54,345 19,426
Derivatives:    
Interest rate swap 54,345 19,426
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 436,032 261,199
Securities available for sale, at fair value 1,945,445 1,774,821
HTM securities 555,144 492,272
Restricted stock 130,848 124,602
Loans held for sale, at fair value 55,405  
Net loans 12,568,642 9,675,162
Derivatives:    
Fair value hedges 182 1,872
Accrued interest receivable 52,721 46,062
Bank owned life insurance 322,917 263,034
LIABILITIES    
Deposits 13,304,981 9,970,960
Borrowings 1,513,748 1,756,278
Accrued interest payable 6,108 5,284
Derivatives:    
Cash flow hedges 1,147 4,786
Fair value hedges 6,256 1,684
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate swap 54,345 19,426
Derivatives:    
Interest rate swap $ 54,345 $ 19,426