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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 2,405,568 | $ 1,919,119
Investment securities held to maturity | 1,318,780 | 1,280,293
Loans held for sale | 4,430 | 3,966
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 187,901 | 192,896
Interest-bearing deposits | 392,806 | 392,305
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 asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 11,103,474 | 10,482,865
Borrowings: |  |
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and other borrowings | 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 deposits | 0 | 0
Investment securities available for sale | 2,403,422 | 1,916,640
Investment securities held to maturity | 1,299,944 | 1,260,815
Loans held for sale | 4,430 | 3,966
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 28,736
Interest rate swap asset | 48,576 | 74,335
Interest receivable | 54,662 | 53,948
Liabilities: |  |
Deposits | 847,398 | 878,257
Borrowings: |  |
Securities sold under repurchase agreements | 185,716 | 177,097
Federal Home Loan Bank advances | 366,179 | 399,991
Subordinated debentures and other borrowings | 108,124 | 108,439
Interest rate swap liability | 50,284 | 76,353
Interest payable | 4,020 | 3,287
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities available for sale | 2,146 | 2,479
Investment securities held to maturity | 18,836 | 19,478
Loans held for sale | 0 | 0
Loans | 9,168,023 | 9,191,628
Federal Home Loan Bank stock | 0 | 0
Interest rate swap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 0 | 0
Borrowings: |  |
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and other borrowings | 0 | 0
Interest rate swap liability | 0 | 0
Interest payable | 0 | 0
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 187,901 | 192,896
Interest-bearing deposits | 392,806 | 392,305
Investment securities available for sale | 2,405,568 | 1,919,119
Investment securities held to maturity | 1,295,289 | 1,227,668
Loans held for sale | 4,430 | 3,966
Loans | 9,117,146 | 9,112,526
Federal Home Loan Bank stock | 28,736 | 28,736
Interest rate swap asset | 48,576 | 74,335
Interest receivable | 54,662 | 53,948
Liabilities: |  |
Deposits | 11,951,780 | 11,361,610
Borrowings: |  |
Securities sold under repurchase agreements | 185,721 | 177,102
Federal Home Loan Bank advances | 359,337 | 389,430
Subordinated debentures and other borrowings | 118,439 | 118,380
Interest rate swap liability | 50,284 | 76,353
Interest payable | $ 4,020 | $ 3,287

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