Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Assets [Abstract]
Securities available for sale		$ 1,348,378	$ 1,072,159
Federal Home Loan Bank and Federal Reserve Bank Stock		18,427	18,427
Liabilities [Abstract]
Other borrowings		30,007	30,012
Subordinated debt		39,338	39,281
Subordinated debentures		39,575	39,524
Reciprocal deposits included in deposits with no stated maturity		560,915	518,400
Reciprocal deposits included in deposits with stated maturity		35,278	37,785
Recorded Book Balance [Member]
Assets [Abstract]
Cash and due from banks		49,946	56,006
Interest bearing deposits		75,675	62,699
Securities available for sale		1,348,378	1,072,159
Federal Home Loan Bank and Federal Reserve Bank Stock		18,427	18,427
Net loans and loans held for sale		2,915,910	2,790,683
Accrued interest receivable		12,721	12,315
Derivative financial instruments		13,559	16,782
Liabilities [Abstract]
Deposits with no stated maturity	[1]	3,661,774	3,198,338
Deposits with stated maturity	[1]	350,294	439,017
Other borrowings		30,007	30,012
Subordinated debt		39,338	39,281
Subordinated debentures		39,575	39,524
Accrued interest payable		1,112	601
Derivative financial instruments		6,583	11,754
Fair Value [Member]
Assets [Abstract]
Cash and due from banks		49,946	56,006
Interest bearing deposits		75,675	62,699
Securities available for sale		1,348,378	1,072,159
Net loans and loans held for sale		2,949,021	2,794,058
Accrued interest receivable		12,721	12,315
Derivative financial instruments		13,559	16,782
Liabilities [Abstract]
Deposits with no stated maturity		3,661,774	3,198,338
Deposits with stated maturity		351,269	441,457
Other borrowings		30,333	30,844
Subordinated debt		45,742	41,417
Subordinated debentures		29,474	30,265
Accrued interest payable		1,112	601
Derivative financial instruments		6,583	11,754
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and due from banks		49,946	56,006
Interest bearing deposits		75,675	62,699
Securities available for sale		0	0
Net loans and loans held for sale		0	0
Accrued interest receivable		2	3
Derivative financial instruments		0	0
Liabilities [Abstract]
Deposits with no stated maturity		3,661,774	3,198,338
Deposits with stated maturity		0	0
Other borrowings		0	0
Subordinated debt		0	0
Subordinated debentures		0	0
Accrued interest payable		67	59
Derivative financial instruments		0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and due from banks		0	0
Interest bearing deposits		0	0
Securities available for sale		1,348,378	1,072,159
Net loans and loans held for sale		78,731	92,434
Accrued interest receivable		5,691	3,414
Derivative financial instruments		13,559	16,782
Liabilities [Abstract]
Deposits with no stated maturity		0	0
Deposits with stated maturity		351,269	441,457
Other borrowings		30,333	30,844
Subordinated debt		45,742	41,417
Subordinated debentures		29,474	30,265
Accrued interest payable		1,045	542
Derivative financial instruments		6,583	11,754
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and due from banks		0	0
Interest bearing deposits		0	0
Securities available for sale		0	0
Net loans and loans held for sale		2,870,290	2,701,624
Accrued interest receivable		7,028	8,898
Derivative financial instruments		0	0
Liabilities [Abstract]
Deposits with no stated maturity		0	0
Deposits with stated maturity		0	0
Other borrowings		0	0
Subordinated debt		0	0
Subordinated debentures		0	0
Accrued interest payable		0	0
Derivative financial instruments		$ 0	$ 0

[1] Deposits with no stated maturity include reciprocal deposits with a recorded book balance of $560.915 million and $518.400 million at September 30, 2021 and December 31, 2020, respectively. Deposits with a stated maturity include reciprocal deposits with a recorded book balance of $35.278 million and $37.785 million at September 30, 2021 and December 31, 2020, respectively.