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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, 2018
Dec. 31, 2017
Balance sheet assets    
Securities available for sale $ 670,328 $ 641,382
Securities held to maturity 67,131 73,749
State tax credits held for sale 171 400
Carrying Amount    
Balance sheet assets    
Cash and due from banks 78,119 91,084
Federal funds sold 1,571 1,223
Interest-bearing deposits 79,780 63,661
Securities available for sale 670,328 641,382
Securities held to maturity 67,131 73,749
Other investments, at cost 37,885 26,661
Loans held for sale 738 3,155
Derivative financial instruments 4,895 3,589
Portfolio loans, net 4,223,244 4,054,473
State tax credits held for sale 45,625 43,468
Accrued interest receivable 19,879 14,069
Balance sheet liabilities    
Deposits 4,210,476 4,156,414
Subordinated debentures and notes 118,144 118,105
Federal Home Loan Bank advances 401,000 172,743
Other borrowings 161,795 253,674
Derivative financial instruments 4,895 3,589
Accrued interest payable 2,433 1,730
Estimated fair value    
Balance sheet assets    
Cash and due from banks 78,119 91,084
Federal funds sold 1,571 1,223
Interest-bearing deposits 79,780 63,661
Securities available for sale 670,328 641,382
Securities held to maturity 64,416 73,458
Other investments, at cost 37,885 26,661
Loans held for sale 738 3,155
Derivative financial instruments 4,895 3,589
Portfolio loans, net 4,254,581 4,096,741
State tax credits held for sale 48,622 44,271
Accrued interest receivable 19,879 14,069
Balance sheet liabilities    
Deposits 4,203,913 4,153,323
Subordinated debentures and notes 105,611 105,031
Federal Home Loan Bank advances 400,977 172,893
Other borrowings 161,676 253,530
Derivative financial instruments 4,895 3,589
Accrued interest payable $ 2,433 $ 1,730