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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, 2016
Dec. 31, 2015
Balance sheet assets    
Securities available for sale $ 479,609 $ 451,770
Securities held to maturity 41,031 43,714
State tax credits held for sale 4,801 5,941
Carrying Amount    
Balance sheet assets    
Cash and due from banks 56,789 47,935
Federal funds sold 488 91
Interest-bearing deposits 63,202 47,131
Securities available for sale 479,609 451,770
Securities held to maturity 41,031 43,714
Other investments, at cost 19,789 17,455
Loans held for sale 7,663 6,598
Derivative financial instruments 2,099 1,155
Portfolio loans, net 3,041,223 2,781,879
State tax credits held for sale 44,180 45,850
Accrued interest receivable 8,526 8,399
Balance sheet liabilities    
Deposits 3,124,825 2,784,591
Subordinated debentures 56,807 56,807
Federal Home Loan Bank advances 129,000 110,000
Other borrowings 190,022 270,326
Derivative financial instruments 2,099 1,155
Accrued interest payable 648 629
Estimated fair value    
Balance sheet assets    
Cash and due from banks 56,789 47,935
Federal funds sold 488 91
Interest-bearing deposits 63,202 47,131
Securities available for sale 479,609 451,770
Securities held to maturity 42,218 43,441
Other investments, at cost 19,789 17,455
Loans held for sale 7,663 6,598
Derivative financial instruments 2,099 1,155
Portfolio loans, net 3,045,230 2,782,704
State tax credits held for sale 48,959 49,588
Accrued interest receivable 8,526 8,399
Balance sheet liabilities    
Deposits 3,126,534 2,784,654
Subordinated debentures 36,275 35,432
Federal Home Loan Bank advances 128,996 109,994
Other borrowings 189,996 270,286
Derivative financial instruments 2,099 1,155
Accrued interest payable $ 648 $ 629