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Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 2,344,551 | $ 1,919,119
Investment securities held to maturity | 2,202,503 | 1,280,293
Loans held for sale | 11,187 | 3,966
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 167,146 | 192,896
Interest-bearing deposits | 474,154 | 392,305
Investment securities available for sale | 999 | 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 | 12,038,992 | 10,482,865
Borrowings: |  |
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 | 2,338,061 | 1,916,640
Investment securities held to maturity | 2,188,600 | 1,260,815
Loans held for sale | 11,187 | 3,966
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 28,736
Asset Derivatives | 41,133 | 74,335
Interest receivable | 57,187 | 53,948
Liabilities at December 31: |  |
Deposits | 690,089 | 878,257
Borrowings: |  |
Securities sold under repurchase agreements | 181,572 | 177,097
Federal Home Loan Bank advances | 337,005 | 399,991
Subordinated debentures and term loans | 107,892 | 108,439
Interest rate swap liability | 41,968 | 76,353
Interest payable | 2,762 | 3,287
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits | 0 | 0
Investment securities available for sale | 5,491 | 2,479
Investment securities held to maturity | 13,903 | 19,478
Loans held for sale | 0 | 0
Loans | 9,068,319 | 9,191,628
Federal Home Loan Bank stock | 0 | 0
Asset Derivatives | 0 | 0
Interest receivable | 0 | 0
Liabilities at December 31: |  |
Deposits | 0 | 0
Borrowings: |  |
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 | 167,146 | 192,896
Interest-bearing deposits | 474,154 | 392,305
Investment securities available for sale | 2,344,551 | 1,919,119
Investment securities held to maturity | 2,179,802 | 1,227,668
Loans held for sale | 11,187 | 3,966
Loans | 9,046,464 | 9,112,526
Federal Home Loan Bank stock | 28,736 | 28,736
Asset Derivatives | 41,133 | 74,335
Interest receivable | 57,187 | 53,948
Liabilities at December 31: |  |
Deposits | 12,732,577 | 11,361,610
Borrowings: |  |
Securities sold under repurchase agreements | 181,577 | 177,102
Federal Home Loan Bank advances | 334,055 | 389,430
Subordinated debentures and term loans | 118,618 | 118,380
Interest rate swap liability | 41,968 | 76,353
Interest payable | $ 2,762 | $ 3,287

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