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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

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