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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,824,160 | $ 1,790,025
Investment securities held to maturity | 1,152,518 | 827,566
Loans held for sale | 3,183 | 9,037
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 164,632 | 177,201
Interest-bearing deposits | 273,936 | 118,263
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 receivable | 0 | 0
Liabilities: |  |
Deposits | 9,797,840 | 8,146,745
Borrowings: |  |
Federal funds purchased | 0 | 0
Securities sold under repurchase agreements | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Subordinated debentures and other borrowings | 0 | 0
Interest payable | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap |  |
Assets: |  |
Interest rate swap asset | 0 | 0
Borrowings: |  |
Interest rate swap liability | 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 | 1,821,673 | 1,787,132
Investment securities held to maturity | 1,131,014 | 799,884
Loans held for sale | 3,183 | 9,037
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 28,736
Interest receivable | 52,992 | 48,901
Liabilities: |  |
Deposits | 1,108,656 | 1,675,202
Borrowings: |  |
Federal funds purchased | 80,000 | 55,000
Securities sold under repurchase agreements | 187,732 | 187,801
Federal Home Loan Bank advances | 413,532 | 352,581
Subordinated debentures and other borrowings | 108,427 | 123,571
Interest payable | 5,038 | 6,754
Significant Other Observable Inputs (Level 2) | Interest rate swap |  |
Assets: |  |
Interest rate swap asset | 82,010 | 27,855
Borrowings: |  |
Interest rate swap liability | 84,254 | 29,299
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities available for sale | 2,487 | 2,893
Investment securities held to maturity | 21,504 | 27,682
Loans held for sale | 0 | 0
Loans | 9,198,466 | 8,335,340
Federal Home Loan Bank stock | 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 other borrowings | 0 | 0
Interest payable | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest rate swap |  |
Assets: |  |
Interest rate swap asset | 0 | 0
Borrowings: |  |
Interest rate swap liability | 0 | 0
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 164,632 | 177,201
Interest-bearing deposits | 273,936 | 118,263
Investment securities available for sale | 1,824,160 | 1,790,025
Investment securities held to maturity | 1,109,126 | 806,038
Loans held for sale | 3,183 | 9,037
Loans | 9,117,107 | 8,379,026
Federal Home Loan Bank stock | 28,736 | 28,736
Interest receivable | 52,992 | 48,901
Liabilities: |  |
Deposits | 10,906,153 | 9,839,956
Borrowings: |  |
Federal funds purchased | 80,000 | 55,000
Securities sold under repurchase agreements | 187,732 | 187,946
Federal Home Loan Bank advances | 399,522 | 351,072
Subordinated debentures and other borrowings | 118,320 | 138,685
Interest payable | 5,038 | 6,754
Carrying Amount | Interest rate swap |  |
Assets: |  |
Interest rate swap asset | 82,010 | 27,855
Borrowings: |  |
Interest rate swap liability | $ 84,254 | $ 29,299

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