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Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Balance sheet assets    
Securities available for sale $ 603,121 $ 460,797
Securities held to maturity 76,168 80,463
State tax credits held for sale 1,274 3,585
Carrying Amount    
Balance sheet assets    
Cash and due from banks 76,777 54,288
Federal funds sold 1,155 446
Interest-bearing deposits 107,821 145,048
Securities available for sale 603,121 460,797
Securities held to maturity 76,168 80,463
Other investments, at cost 29,436 14,840
Loans held for sale 6,411 9,562
Derivative financial instruments 3,278 4,016
Loans, net 3,987,467 3,114,752
State tax credits held for sale 35,291 38,071
Accrued interest receivable 14,213 11,117
Balance sheet liabilities    
Deposits 4,059,211 3,233,361
Subordinated debentures and notes 118,093 105,540
Federal Home Loan Bank advances 248,868 0
Other borrowings 219,104 276,980
Derivative financial instruments 3,278 4,016
Accrued interest payable 2,007 1,105
Estimated fair value    
Balance sheet assets    
Cash and due from banks 76,777 54,288
Federal funds sold 1,155 446
Interest-bearing deposits 107,821 145,048
Securities available for sale 603,121 460,797
Securities held to maturity 76,260 79,639
Other investments, at cost 29,436 14,840
Loans held for sale 6,411 9,562
Derivative financial instruments 3,278 4,016
Loans, net 4,009,071 3,125,701
State tax credits held for sale 37,781 41,264
Accrued interest receivable 14,213 11,117
Balance sheet liabilities    
Deposits 4,057,561 3,232,414
Subordinated debentures and notes 100,062 86,052
Federal Home Loan Bank advances 249,168 0
Other borrowings 219,012 276,905
Derivative financial instruments 3,278 4,016
Accrued interest payable $ 2,007 $ 1,105