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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
Dec. 31, 2016
Dec. 31, 2015
Balance sheet assets    
Securities available for sale $ 460,797 $ 451,770
Securities held to maturity 80,463 43,714
State tax credits held for sale 3,585 5,941
Carrying Amount    
Balance sheet assets    
Cash and due from banks 54,288 47,935
Federal funds sold 446 91
Interest-bearing deposits 145,048 47,131
Securities available for sale 460,797 451,770
Securities held to maturity 80,463 43,714
Other investments, at cost 14,840 17,455
Loans held for sale 9,562 6,598
Derivative financial instruments 4,016 1,155
Portfolio loans, net 3,114,752 2,781,879
State tax credits held for sale 38,071 45,850
Accrued interest receivable 11,117 8,399
Balance sheet liabilities    
Deposits 3,233,361 2,784,591
Subordinated debentures 105,540 56,807
Federal Home Loan Bank advances 0 110,000
Other borrowings 276,980 270,326
Derivative financial instruments 4,016 1,155
Accrued interest payable 1,105 629
Estimated fair value    
Balance sheet assets    
Cash and due from banks 54,288 47,935
Federal funds sold 446 91
Interest-bearing deposits 145,048 47,131
Securities available for sale 460,797 451,770
Securities held to maturity 79,639 43,441
Other investments, at cost 14,840 17,455
Loans held for sale 9,562 6,598
Derivative financial instruments 4,016 1,155
Portfolio loans, net 3,125,701 2,782,704
State tax credits held for sale 41,264 49,588
Accrued interest receivable 11,117 8,399
Balance sheet liabilities    
Deposits 3,232,414 2,784,654
Subordinated debentures 86,052 35,432
Federal Home Loan Bank advances 0 109,994
Other borrowings 276,905 270,286
Derivative financial instruments 4,016 1,155
Accrued interest payable $ 1,105 $ 629