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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,890,593 | $ 1,790,025
Investment securities held to maturity | 941,426 | 827,566
Loans held for sale | 901 | 9,037
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 229,759 | 177,201
Interest-bearing time deposits | 380,021 | 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 rate swap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 9,566,516 | 8,146,745
Borrowings: |  |
Federal funds purchased |  | 0
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 time deposits | 0 | 0
Investment securities available for sale | 1,888,093 | 1,787,132
Investment securities held to maturity | 920,146 | 799,884
Loans held for sale | 901 | 9,037
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 28,736
Interest rate swap asset | 84,658 | 27,855
Interest receivable | 57,063 | 48,901
Liabilities: |  |
Deposits | 1,395,002 | 1,675,202
Borrowings: |  |
Federal funds purchased |  | 55,000
Securities sold under repurchase agreements | 181,150 | 187,801
Federal Home Loan Bank advances | 415,737 | 352,581
Subordinated debentures and other borrowings | 276,306 | 123,571
Interest rate swap liability | 87,205 | 29,299
Interest payable | 5,587 | 6,754
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing time deposits | 0 | 0
Investment securities available for sale | 2,500 | 2,893
Investment securities held to maturity | 21,280 | 27,682
Loans held for sale | 0 | 0
Loans | 9,253,762 | 8,335,340
Federal Home Loan Bank stock | 0 | 0
Interest rate swap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 0 | 0
Borrowings: |  |
Federal funds purchased |  | 0
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 | 229,759 | 177,201
Interest-bearing time deposits | 380,021 | 118,263
Investment securities available for sale | 1,890,593 | 1,790,025
Investment securities held to maturity | 898,786 | 806,038
Loans held for sale | 901 | 9,037
Loans | 9,177,422 | 8,379,026
Federal Home Loan Bank stock | 28,736 | 28,736
Interest rate swap asset | 84,658 | 27,855
Interest receivable | 57,063 | 48,901
Liabilities: |  |
Deposits | 10,965,988 | 9,839,956
Borrowings: |  |
Federal funds purchased |  | 55,000
Securities sold under repurchase agreements | 181,150 | 187,946
Federal Home Loan Bank advances | 400,817 | 351,072
Subordinated debentures and other borrowings | 285,197 | 138,685
Interest rate swap liability | 87,205 | 29,299
Interest payable | $ 5,587 | $ 6,754

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