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FAIR VALUE MEASUREMENTS - Summary of Estimated Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial Assets    
Trading security $ 12,277 $ 13,229
Securities available for sale, at fair value 1,426,099 1,209,537
Securities held to maturity 405,276 337,680
FHLB stock and restricted equity securities 63,085 71,112
Accrued interest receivable 33,739 26,113
Assets held for sale 1,392 0
Level 1    
Financial Assets    
Cash and cash equivalents 248,763 113,075
Trading security 0 0
Securities available for sale, at fair value 44,850 62,284
Securities held to maturity 0 0
FHLB stock and restricted equity securities 0 0
Net loans 0 0
Loans held for sale 0 0
Accrued interest receivable 0 0
Derivative assets 0 622
Assets held for sale 0 0
Financial Liabilities    
Total deposits 0 0
Short-term debt 0 0
Long-term FHLB advances 0 0
Subordinated notes 0 0
Derivative liabilities 104 0
Level 2    
Financial Assets    
Cash and cash equivalents 0 0
Trading security 0 0
Securities available for sale, at fair value 1,381,249 1,147,253
Securities held to maturity 371,458 300,806
Net loans 0 0
Loans held for sale 153,620 120,673
Accrued interest receivable 33,739 26,113
Derivative assets 14,049 16,157
Assets held for sale 1,392 322
Financial Liabilities    
Total deposits 8,731,527 6,624,108
Short-term debt 667,246 1,081,996
Long-term FHLB advances 378,766 143,151
Subordinated notes 97,414 96,973
Derivative liabilities 15,715 24,420
Level 3    
Financial Assets    
Cash and cash equivalents 0 0
Trading security 12,277 13,229
Securities available for sale, at fair value 0 0
Securities held to maturity 33,818 36,874
FHLB stock and restricted equity securities 0 0
Net loans 8,422,034 6,532,745
Loans held for sale 0 0
Accrued interest receivable 0 0
Derivative assets 5,259 4,838
Assets held for sale 0 0
Financial Liabilities    
Total deposits 0 0
Short-term debt 0 0
Long-term FHLB advances 0 0
Subordinated notes 0 0
Derivative liabilities 19 0
Carrying Amount    
Financial Assets    
Cash and cash equivalents 248,763 113,075
Trading security 12,277 13,229
Securities available for sale, at fair value 1,426,099 1,209,537
Securities held to maturity 397,103 334,368
FHLB stock and restricted equity securities 63,085 71,112
Net loans 8,247,504 6,505,789
Loans held for sale 153,620 120,673
Accrued interest receivable 33,739 26,113
Derivative assets 19,308 21,617
Assets held for sale 1,392 322
Financial Liabilities    
Total deposits 8,749,530 6,622,092
Short-term debt 667,300 1,082,044
Long-term FHLB advances 380,436 142,792
Subordinated notes 89,339 89,161
Derivative liabilities 15,838 24,420
Fair Value    
Financial Assets    
Cash and cash equivalents 248,763 113,075
Trading security 12,277 13,229
Securities available for sale, at fair value 1,426,099 1,209,537
Securities held to maturity 405,276 337,680
Net loans 8,422,034 6,532,745
Loans held for sale 153,620 120,673
Accrued interest receivable 33,739 26,113
Derivative assets 19,308 21,617
Assets held for sale 1,392 322
Financial Liabilities    
Total deposits 8,731,527 6,624,108
Short-term debt 667,246 1,081,996
Long-term FHLB advances 378,766 143,151
Subordinated notes 97,414 96,973
Derivative liabilities $ 15,838 $ 24,420