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
Jun. 30, 2018
Dec. 31, 2017
ASSETS    
Cash and cash equivalents $ 578,053 $ 199,373
Securities available for sale, at fair value 1,558,048 974,222
HTM securities 47,649 203,483
Restricted stock 104,837 75,283
Loans held for sale 40,190 40,662
Net loans 9,149,667 7,117,593
Derivatives:    
Cash flow hedges   49
Fair value hedges 2,925 1,598
Best efforts forward delivery commitments   12
Accrued interest receivable 37,314 26,427
Bank owned life insurance 260,124 182,854
LIABILITIES    
Deposits 9,814,479 6,977,845
Borrowings 1,287,968 1,198,645
Accrued interest payable 3,794 2,538
Derivatives:    
Interest rate swap 20,606 1,350
Cash flow hedges 3,671 8,005
Best efforts forward delivery commitments 182  
Fair value hedges 35 76
Interest Rate Swap    
Derivatives:    
Interest rate derivative 20,606 1,350
Interest Rate Lock Commitments    
Derivatives:    
Interest rate lock commitments 200 559
Carrying Value    
ASSETS    
Cash and cash equivalents 578,053 199,373
Securities available for sale, at fair value 1,558,048 974,222
HTM securities 47,604 199,639
Restricted stock 104,837 75,283
Loans held for sale 40,190 40,662
Net loans 9,248,989 7,103,344
Derivatives:    
Cash flow hedges   49
Fair value hedges 2,925 1,598
Best efforts forward delivery commitments   12
Accrued interest receivable 37,314 26,427
Bank owned life insurance 260,124 182,854
LIABILITIES    
Deposits 9,797,272 6,991,718
Borrowings 1,300,276 1,219,414
Accrued interest payable 3,794 2,538
Derivatives:    
Interest rate swap 20,606 1,350
Cash flow hedges 3,671 8,005
Best efforts forward delivery commitments 182  
Fair value hedges 35 76
Carrying Value | Interest Rate Swap    
Derivatives:    
Interest rate derivative 20,606 1,350
Carrying Value | Interest Rate Lock Commitments    
Derivatives:    
Interest rate lock commitments 200 559
Quoted Prices in Active Markets for Identical Assets Level 1    
ASSETS    
Cash and cash equivalents 578,053 199,373
Securities available for sale, at fair value 0 0
HTM securities 0 0
Restricted stock 0 0
Loans held for sale 0 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
Derivatives:    
Interest rate swap 0 0
Cash flow hedges 0 0
Best efforts forward delivery commitments 0  
Fair value hedges 0 0
Quoted Prices in Active Markets for Identical Assets Level 1 | Interest Rate Swap    
Derivatives:    
Interest rate derivative 0 0
Quoted Prices in Active Markets for Identical Assets Level 1 | Interest Rate Lock Commitments    
Derivatives:    
Interest rate lock commitments 0 0
Significant Other Observable Inputs Level 2    
ASSETS    
Cash and cash equivalents 0 0
Securities available for sale, at fair value 1,558,048 974,222
HTM securities 47,649 203,483
Restricted stock 104,837 75,283
Loans held for sale 40,190 40,662
Net loans 0 0
Derivatives:    
Cash flow hedges   49
Fair value hedges 2,925 1,598
Best efforts forward delivery commitments   0
Accrued interest receivable 37,314 26,427
Bank owned life insurance 260,124 182,854
LIABILITIES    
Deposits 9,814,479 6,977,845
Borrowings 1,287,968 1,198,645
Accrued interest payable 3,794 2,538
Derivatives:    
Interest rate swap 20,606 1,350
Cash flow hedges 3,671 8,005
Best efforts forward delivery commitments 0  
Fair value hedges 35 76
Significant Other Observable Inputs Level 2 | Interest Rate Swap    
Derivatives:    
Interest rate derivative 20,606 1,350
Significant Other Observable Inputs Level 2 | Interest Rate Lock Commitments    
Derivatives:    
Interest rate lock commitments 0 0
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 0
Net loans 9,149,667 7,117,593
Derivatives:    
Cash flow hedges   0
Fair value hedges 0 0
Best efforts forward delivery commitments   12
Accrued interest receivable 0 0
Bank owned life insurance 0 0
LIABILITIES    
Deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Derivatives:    
Interest rate swap 0 0
Cash flow hedges 0 0
Best efforts forward delivery commitments 182  
Fair value hedges 0 0
Significant Unobservable Inputs Level 3 | Interest Rate Swap    
Derivatives:    
Interest rate derivative 0 0
Significant Unobservable Inputs Level 3 | Interest Rate Lock Commitments    
Derivatives:    
Interest rate lock commitments $ 200 $ 559