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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 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Balance sheet assets |  |
Securities available for sale | $ 478,514 | $ 451,770
Securities held to maturity | 42,514 | 43,714
State tax credits held for sale | 4,774 | 5,941
Carrying Amount |  |
Balance sheet assets |  |
Cash and due from banks | 50,370 | 47,935
Federal funds sold | 317 | 91
Interest-bearing deposits | 60,609 | 47,131
Securities available for sale | 478,514 | 451,770
Securities held to maturity | 42,514 | 43,714
Other investments, at cost | 17,403 | 17,455
Loans held for sale | 9,669 | 6,598
Derivative financial instruments | 2,264 | 1,155
Portfolio loans, net | 2,896,389 | 2,781,879
State tax credits held for sale | 44,918 | 45,850
Accrued interest receivable | 8,123 | 8,399
Balance sheet liabilities |  |
Deposits | 3,028,236 | 2,784,591
Subordinated debentures | 56,807 | 56,807
Federal Home Loan Bank advances | 78,000 | 110,000
Other borrowings | 200,362 | 270,326
Derivative financial instruments | 2,264 | 1,155
Accrued interest payable | 625 | 629
Estimated fair value |  |
Balance sheet assets |  |
Cash and due from banks | 50,370 | 47,935
Federal funds sold | 317 | 91
Interest-bearing deposits | 60,609 | 47,131
Securities available for sale | 478,514 | 451,770
Securities held to maturity | 43,837 | 43,441
Other investments, at cost | 17,403 | 17,455
Loans held for sale | 9,669 | 6,598
Derivative financial instruments | 2,264 | 1,155
Portfolio loans, net | 2,902,083 | 2,782,704
State tax credits held for sale | 49,961 | 49,588
Accrued interest receivable | 8,123 | 8,399
Balance sheet liabilities |  |
Deposits | 3,030,334 | 2,784,654
Subordinated debentures | 35,771 | 35,432
Federal Home Loan Bank advances | 78,000 | 109,994
Other borrowings | 200,332 | 270,286
Derivative financial instruments | 2,264 | 1,155
Accrued interest payable | $ 625 | $ 629

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