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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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