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Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,142,195 | $ 999,947
Investment securities held to maturity | 489,217 | 568,208
Loans held for sale | 4,778 | 7,216
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 139,247 | 154,905
Interest-bearing time deposits | 36,963 | 35,027
Investment securities available for sale |  |
Liabilities: |  |
Deposits | 6,267,879 | 5,741,019
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Investment securities available for sale | 1,138,867 | 995,969
Investment securities held to maturity | 481,377 | 556,305
Loans held for sale | 4,778 | 7,216
Federal Home Loan Bank stock | 24,588 | 23,825
Interest rate swap asset | 12,083 | 7,323
Interest receivable | 40,881 | 37,130
Liabilities: |  |
Deposits | 1,464,129 | 1,406,526
Borrowings: |  |
Federal funds purchased | 104,000 | 144,038
Securities sold under repurchase agreements | 113,437 | 136,562
Federal Home Loan Bank advances | 318,728 | 361,085
Subordinated debentures and term loans | 127,298 | 120,085
Interest rate swap liability | 12,636 | 8,688
Interest payable | 5,607 | 4,390
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Investment securities available for sale | 3,328 | 3,978
Investment securities held to maturity | 7,840 | 11,903
Loans | 7,004,193 | 6,534,877
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 139,247 | 154,905
Interest-bearing time deposits | 36,963 | 35,027
Investment securities available for sale | 1,142,195 | 999,947
Investment securities held to maturity | 490,387 | 560,655
Loans held for sale | 4,778 | 7,216
Loans | 7,143,915 | 6,676,167
Federal Home Loan Bank stock | 24,588 | 23,825
Interest rate swap asset | 12,083 | 7,323
Interest receivable | 40,881 | 37,130
Liabilities: |  |
Deposits | 7,754,593 | 7,172,530
Borrowings: |  |
Federal funds purchased | 104,000 | 144,038
Securities sold under repurchase agreements | 113,512 | 136,623
Federal Home Loan Bank advances | 314,986 | 414,377
Subordinated debentures and term loans | 138,463 | 139,349
Interest rate swap liability | 12,636 | 8,688
Interest payable | $ 5,607 | $ 4,390

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