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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

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