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
Sep. 30, 2017
Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 23,831 $ 33,595
Loans 2,404,355 1,959,929
Total pledged assets 2,967,974 2,533,517
AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 332,910 342,104
HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 206,878 197,889
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 431,031 408,435
Public deposits | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 224,153 210,546
Public deposits | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 206,878 197,889
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 88,257 108,208
Repurchase agreements | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 88,257 108,208
Repurchase agreements | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 2,404,355 1,959,929
Total pledged assets 2,405,377 1,961,404
FHLB advances | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 1,022 1,475
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 23,831 33,595
Loans 0 0
Total pledged assets 27,729 37,971
Derivatives | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 3,898 4,376
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 15,580 17,499
Other purposes | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 15,580 17,499
Other purposes | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 0 $ 0