Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details)

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COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 38,948 $ 13,509
Loans 3,779,006 3,337,289
Total pledged assets 4,875,380 3,732,286
AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 809,247 374,081
HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 248,179 7,407
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 748,109 300,576
Public deposits | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 516,691 293,169
Public deposits | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 231,418 7,407
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 99,526 55,269
Repurchase agreements | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 94,741 55,269
Repurchase agreements | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 4,785 0
FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 3,779,006 3,337,289
Total pledged assets 3,870,060 3,337,777
FHLB advances | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 91,054 488
FHLB advances | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 38,948 13,509
Loans 0 0
Total pledged assets 40,696 15,447
Derivatives | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 1,748 1,938
Derivatives | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 116,989 23,217
Other purposes | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 105,013 23,217
Other purposes | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 11,976 $ 0