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Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 1,646,399 | $ 1,142,195
Investment securities held to maturity | 865,286 | 489,217
Loans held for sale | 7,910 | 4,778
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 202,383 | 139,247
Interest-bearing time deposits | 230,101 | 36,963
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 and cap asset | 0 | 0
Interest receivable | 0 | 0
Liabilities: |  |
Deposits | 7,992,716 | 6,267,879
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 time deposits | 0 | 0
Investment securities available for sale | 1,643,503 | 1,138,867
Investment securities held to maturity | 832,750 | 481,377
Loans held for sale | 7,910 | 4,778
Loans | 0 | 0
Federal Home Loan Bank stock | 28,736 | 24,588
Interest rate swap and cap asset | 37,899 | 12,083
Interest receivable | 45,923 | 40,881
Liabilities: |  |
Deposits | 1,752,081 | 1,464,129
Borrowings: |  |
Federal funds purchased | 0 | 104,000
Securities sold under repurchase agreements | 191,603 | 113,437
Federal Home Loan Bank advances | 357,166 | 318,728
Subordinated debentures and term loans | 124,453 | 127,298
Interest rate swap liability | 39,629 | 12,636
Interest payable | 7,855 | 5,607
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Interest-bearing time deposits | 0 | 0
Investment securities available for sale | 2,896 | 3,328
Investment securities held to maturity | 32,536 | 7,840
Loans held for sale | 0 | 0
Loans | 8,206,069 | 7,004,193
Federal Home Loan Bank stock | 0 | 0
Interest rate swap and cap asset | 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 term loans | 0 | 0
Interest rate swap liability | 0 | 0
Interest payable | 0 | 0
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 202,383 | 139,247
Interest-bearing time deposits | 230,101 | 36,963
Investment securities available for sale | 1,646,399 | 1,142,195
Investment securities held to maturity | 843,021 | 490,387
Loans held for sale | 7,910 | 4,778
Loans | 8,218,689 | 7,143,915
Federal Home Loan Bank stock | 28,736 | 24,588
Interest rate swap and cap asset | 37,899 | 12,083
Interest receivable | 45,923 | 40,881
Liabilities: |  |
Deposits | 9,765,451 | 7,754,593
Borrowings: |  |
Federal funds purchased | 0 | 104,000
Securities sold under repurchase agreements | 191,603 | 113,512
Federal Home Loan Bank advances | 354,609 | 314,986
Subordinated debentures and term loans | 138,630 | 138,463
Interest rate swap liability | 39,629 | 12,636
Interest payable | $ 7,855 | $ 5,607

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