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 ($)
Dec. 31, 2018
Dec. 31, 2017
ASSETS    
Cash and cash equivalents $ 261,199,000 $ 199,373,000
Securities available for sale, at fair value 1,774,821,000 974,222,000
HTM securities 499,501,000 203,483,000
Restricted stock 124,602,000 75,283,000
Loans held for sale 0 40,662,000
Net loans 9,534,717,000 7,117,593,000
Derivatives:    
Cash flow hedges   49,000
Fair value hedges 1,872,000 1,598,000
Best efforts forward delivery commitments   12,000
Accrued interest receivable 46,062,000 26,427,000
Bank owned life insurance 263,034,000 182,854,000
LIABILITIES    
Deposits 9,989,788,000 6,977,845,000
Borrowings 1,742,038,000 1,198,645,000
Accrued interest payable 5,284,000 2,538,000
Interest rate swap 19,426,000 1,350,000
Cash flow hedges 4,786,000 8,005,000
Fair value hedges 1,684,000 76,000
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 261,199,000 199,373,000
Securities available for sale, at fair value 0 0
HTM securities 0 0
Restricted stock 0 0
Loans held for sale   0
Net loans 0 0
Derivatives:    
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   0
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Interest rate swap 0 0
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 1,774,821,000 974,222,000
HTM securities 499,501,000 203,483,000
Restricted stock 124,602,000 75,283,000
Loans held for sale   40,662,000
Net loans 0 0
Derivatives:    
Cash flow hedges   49,000
Fair value hedges 1,872,000 1,598,000
Best efforts forward delivery commitments   0
Accrued interest receivable 46,062,000 26,427,000
Bank owned life insurance 263,034,000 182,854,000
LIABILITIES    
Deposits 9,989,788,000 6,977,845,000
Borrowings 1,742,038,000 1,198,645,000
Accrued interest payable 5,284,000 2,538,000
Interest rate swap 19,426,000 1,350,000
Cash flow hedges 4,786,000 8,005,000
Fair value hedges 1,684,000 76,000
Significant Unobservable Inputs Level 3    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 0 0
HTM securities 0 0
Restricted stock 0 0
Loans held for sale   0
Net loans 9,534,717,000 7,117,593,000
Derivatives:    
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   12,000
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Interest rate swap 0 0
Cash flow hedges 0 0
Fair value hedges 0 0
Interest Rate Swap    
Derivatives:    
Interest rate derivatives 19,426,000 1,350,000
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets Level 1    
Derivatives:    
Interest rate derivatives 0 0
Interest Rate Swap | Significant Other Observable Inputs Level 2    
Derivatives:    
Interest rate derivatives 19,426,000 1,350,000
Interest Rate Swap | Significant Unobservable Inputs Level 3    
Derivatives:    
Interest rate derivatives 0 0
Interest Rate Lock Commitments    
Derivatives:    
Interest rate derivatives   559,000
Interest Rate Lock Commitments | Quoted Prices in Active Markets for Identical Assets Level 1    
Derivatives:    
Interest rate derivatives   0
Interest Rate Lock Commitments | Significant Other Observable Inputs Level 2    
Derivatives:    
Interest rate derivatives   0
Interest Rate Lock Commitments | Significant Unobservable Inputs Level 3    
Derivatives:    
Interest rate derivatives   559,000
Carrying Value    
ASSETS    
Cash and cash equivalents 261,199,000 199,373,000
Securities available for sale, at fair value 1,774,821,000 974,222,000
HTM securities 492,272,000 199,639,000
Restricted stock 124,602,000 75,283,000
Loans held for sale   40,662,000
Net loans 9,675,162,000 7,103,344,000
Derivatives:    
Cash flow hedges   49,000
Fair value hedges 1,872,000 1,598,000
Best efforts forward delivery commitments   12,000
Accrued interest receivable 46,062,000 26,427,000
Bank owned life insurance 263,034,000 182,854,000
LIABILITIES    
Deposits 9,970,960,000 6,991,718,000
Borrowings 1,756,278,000 1,219,414,000
Accrued interest payable 5,284,000 2,538,000
Interest rate swap 19,426,000 1,350,000
Cash flow hedges 4,786,000 8,005,000
Fair value hedges 1,684,000 76,000
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate derivatives $ 19,426,000 1,350,000
Carrying Value | Interest Rate Lock Commitments    
Derivatives:    
Interest rate derivatives   $ 559,000