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Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,919,119 | $ 1,790,025
Investment securities held to maturity | 1,280,293 | 827,566
Loans held for sale | 3,966 | 9,037
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 192,896 | 177,201
Interest-bearing deposits | 392,305 | 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
Asset Derivatives | 0 | 0
Interest receivable | 0 | 0
Liabilities at December 31: |  |
Deposits | 10,482,865 | 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 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 deposits | 0 | 0
Investment securities available for sale | 1,916,640 | 1,787,132
Investment securities held to maturity | 1,260,815 | 799,884
Loans held for sale | 3,966 | 9,037
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 28,736
Asset Derivatives | 74,335 | 27,855
Interest receivable | 53,948 | 48,901
Liabilities at December 31: |  |
Deposits | 878,257 | 1,675,202
Borrowings: |  |
Federal funds purchased | 0 | 55,000
Securities sold under repurchase agreements | 177,097 | 187,801
Federal Home Loan Bank advances | 399,991 | 352,581
Subordinated debentures and term loans | 108,439 | 123,571
Interest rate swap liability | 76,353 | 29,299
Interest payable | 3,287 | 6,754
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities available for sale | 2,479 | 2,893
Investment securities held to maturity | 19,478 | 27,682
Loans held for sale | 0 | 0
Loans | 9,191,628 | 8,335,340
Federal Home Loan Bank stock | 0 | 0
Asset Derivatives | 0 | 0
Interest receivable | 0 | 0
Liabilities at December 31: |  |
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 | 192,896 | 177,201
Interest-bearing deposits | 392,305 | 118,263
Investment securities available for sale | 1,919,119 | 1,790,025
Investment securities held to maturity | 1,227,668 | 806,038
Loans held for sale | 3,966 | 9,037
Loans | 9,112,526 | 8,379,026
Federal Home Loan Bank stock | 28,736 | 28,736
Asset Derivatives | 74,335 | 27,855
Interest receivable | 53,948 | 48,901
Liabilities at December 31: |  |
Deposits | 11,361,610 | 9,839,956
Borrowings: |  |
Federal funds purchased | 0 | 55,000
Securities sold under repurchase agreements | 177,102 | 187,946
Federal Home Loan Bank advances | 389,430 | 351,072
Subordinated debentures and term loans | 118,380 | 138,685
Interest rate swap liability | 76,353 | 29,299
Interest payable | $ 3,287 | $ 6,754

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