Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 23,870 $ 33,595
Loans 2,390,509 1,959,929
Total pledged assets 2,951,852 2,533,517
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 439,954 408,435
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 77,942 108,208
FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 2,390,509 1,959,929
Total pledged assets 2,391,387 1,961,404
Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 23,870 33,595
Loans 0 0
Total pledged assets 27,526 37,971
Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 15,043 17,499
Available-for-sale Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 339,991 342,104
Available-for-sale Securities | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 242,472 210,546
Available-for-sale Securities | Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 77,942 108,208
Available-for-sale Securities | FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 878 1,475
Available-for-sale Securities | Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 3,656 4,376
Available-for-sale Securities | Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 15,043 17,499
Held-to-maturity Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 197,482 197,889
Held-to-maturity Securities | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 197,482 197,889
Held-to-maturity Securities | Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Held-to-maturity Securities | FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Held-to-maturity Securities | Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Held-to-maturity Securities | Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 0 $ 0