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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, 2017 | Dec. 31, 2016
--- | --- | ---
Balance sheet assets |  |
Securities available for sale | $ 623,857 | $ 460,797
Securities held to maturity | 77,641 | 80,463
State tax credits held for sale | 1,274 | 3,585
Carrying Amount |  |
Balance sheet assets |  |
Cash and due from banks | 77,815 | 54,288
Federal funds sold | 912 | 446
Interest-bearing deposits | 40,507 | 145,048
Securities available for sale | 623,857 | 460,797
Securities held to maturity | 77,641 | 80,463
Other investments, at cost | 26,477 | 14,840
Loans held for sale | 4,285 | 9,562
Derivative financial instruments | 3,577 | 4,016
Loans, net | 3,852,971 | 3,114,752
State tax credits held for sale | 35,247 | 38,071
Accrued interest receivable | 11,923 | 11,117
Balance sheet liabilities |  |
Deposits | 3,921,251 | 3,233,361
Subordinated debentures and notes | 118,080 | 105,540
Federal Home Loan Bank advances | 200,992 | 0
Other borrowings | 217,180 | 276,980
Derivative financial instruments | 3,577 | 4,016
Accrued interest payable | 1,459 | 1,105
Estimated fair value |  |
Balance sheet assets |  |
Cash and due from banks | 77,815 | 54,288
Federal funds sold | 912 | 446
Interest-bearing deposits | 40,507 | 145,048
Securities available for sale | 623,857 | 460,797
Securities held to maturity | 77,831 | 79,639
Other investments, at cost | 26,477 | 14,840
Loans held for sale | 4,285 | 9,562
Derivative financial instruments | 3,577 | 4,016
Loans, net | 3,867,481 | 3,125,701
State tax credits held for sale | 36,857 | 41,264
Accrued interest receivable | 11,923 | 11,117
Balance sheet liabilities |  |
Deposits | 3,919,379 | 3,232,414
Subordinated debentures and notes | 99,873 | 86,052
Federal Home Loan Bank advances | 201,397 | 0
Other borrowings | 217,077 | 276,905
Derivative financial instruments | 3,577 | 4,016
Accrued interest payable | $ 1,459 | $ 1,105

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