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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,399,959 | $ 1,142,195
Investment securities held to maturity | 708,915 | 489,217
Loans held for sale | 5,854 | 4,778
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 128,185 | 139,247
Interest-bearing time deposits | 129,614 | 36,963
Investment securities available for sale | 0 | 0
Investment securities held to maturity | 0 | 0
Loans held for sale | 0 | 0
Loans | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Interest rate swap and cap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 6,688,194 | 6,267,879
Borrowings: |  |
Federal funds purchased | 0 | 0
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and term loans | 0 | 0
Interest rate swap liability | 0 | 0
Interest payable | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing time deposits | 0 | 0
Investment securities available for sale | 1,396,984 | 1,138,867
Investment securities held to maturity | 701,905 | 481,377
Loans held for sale | 5,854 | 4,778
Loans | 0 | 0
Federal Home Loan Bank stock | 24,588 | 24,588
Interest rate swap and cap asset | 25,059 | 12,083
Interest receivable | 45,150 | 40,881
Liabilities: |  |
Deposits | 1,627,381 | 1,464,129
Borrowings: |  |
Federal funds purchased | 75,000 | 104,000
Securities sold under repurchase agreements | 119,488 | 113,437
Federal Home Loan Bank advances | 461,582 | 318,728
Subordinated debentures and term loans | 127,594 | 127,298
Interest rate swap liability | 26,668 | 12,636
Interest payable | 6,740 | 5,607
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing time deposits | 0 | 0
Investment securities available for sale | 2,975 | 3,328
Investment securities held to maturity | 7,010 | 7,840
Loans held for sale | 0 | 0
Loans | 7,408,511 | 7,004,193
Federal Home Loan Bank stock | 0 | 0
Interest rate swap and cap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 0 | 0
Borrowings: |  |
Federal funds purchased | 0 | 0
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and term loans | 0 | 0
Interest rate swap liability | 0 | 0
Interest payable | 0 | 0
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 128,185 | 139,247
Interest-bearing time deposits | 129,614 | 36,963
Investment securities available for sale | 1,399,959 | 1,142,195
Investment securities held to maturity | 692,965 | 490,387
Loans held for sale | 5,854 | 4,778
Loans | 7,430,096 | 7,143,915
Federal Home Loan Bank stock | 24,588 | 24,588
Interest rate swap and cap asset | 25,059 | 12,083
Interest receivable | 45,150 | 40,881
Liabilities: |  |
Deposits | 8,319,328 | 7,754,593
Borrowings: |  |
Federal funds purchased | 75,000 | 104,000
Securities sold under repurchase agreements | 119,674 | 113,512
Federal Home Loan Bank advances | 460,042 | 314,986
Subordinated debentures and term loans | 138,574 | 138,463
Interest rate swap liability | 26,668 | 12,636
Interest payable | $ 6,740 | $ 5,607

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