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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, 2018
Dec. 31, 2017
Balance sheet assets    
Securities available for sale $ 721,369 $ 641,382
Securities held to maturity 65,679 73,749
Carrying Amount    
Balance sheet assets    
Cash and due from banks 91,511 91,084
Federal funds sold 1,714 1,223
Interest-bearing deposits 106,512 63,661
Securities available for sale 721,369 641,382
Securities held to maturity 65,679 73,749
Other investments, at cost 26,654 26,661
Loans held for sale 392 3,155
Derivative financial instruments 3,023 3,589
Portfolio loans, net 4,306,525 4,054,473
State tax credits held for sale 37,587 43,468
Accrued interest receivable 16,069 14,069
Balance sheet liabilities    
Deposits 4,587,985 4,156,414
Subordinated debentures and notes 118,156 118,105
Federal Home Loan Bank advances 70,000 172,743
Other borrowings 223,450 253,674
Derivative financial instruments 3,023 3,589
Accrued interest payable 1,977 1,730
Estimated fair value    
Balance sheet assets    
Cash and due from banks 91,511 91,084
Federal funds sold 1,714 1,223
Interest-bearing deposits 106,512 63,661
Securities available for sale 721,369 641,382
Securities held to maturity 63,934 73,458
Other investments, at cost 26,654 26,661
Loans held for sale 392 3,155
Derivative financial instruments 3,023 3,589
Portfolio loans, net 4,253,239 4,096,741
State tax credits held for sale 39,169 44,271
Accrued interest receivable 16,069 14,069
Balance sheet liabilities    
Deposits 4,583,047 4,153,323
Subordinated debentures and notes 106,316 105,031
Federal Home Loan Bank advances 70,000 172,893
Other borrowings 223,260 253,530
Derivative financial instruments 3,023 3,589
Accrued interest payable $ 1,977 $ 1,730