Loans and Allowance - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Receivables [Abstract]
Loans held for sale	$ 5,990,000		$ 5,990,000				$ 3,966,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,041,576,000		9,041,576,000				9,243,174,000
Non-Accrual Loans	51,502,000		51,502,000				61,471,000
Interest income recognized on non-accrual loans	$ 0	$ 0	$ 0	$ 0
Standby letters of credit usual term	2 years		2 years
Allowance for credit losses on unfunded loan commitments	$ 20,500,000		$ 20,500,000		$ 20,500,000		0
Cumulative effect of ASC 326 adoption
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans						$ 4,776,000
Allowance for credit losses on unfunded loan commitments	20,500,000		20,500,000			$ 20,500,000
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,900,000		38,900,000				72,800,000
Increase (decrease) in past due loans			33,900,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,170,000		12,170,000				19,638,000
Increase (decrease) in past due loans			7,500,000
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,541,000		3,541,000				11,187,000
Increase (decrease) in past due loans			7,600,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	23,163,000		23,163,000				41,950,000
Increase (decrease) in past due loans			18,800,000
PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	198,100,000		198,100,000				667,100,000
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,150,387,000		2,150,387,000				2,220,949,000
Non-Accrual Loans	26,176,000		26,176,000				46,316,000
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,698,000		4,698,000				2,525,000
Commercial real estate, non-owner occupied | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	424,000		424,000				2,109,000
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,210,000		3,210,000				31,634,000
Payoff			23,400,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,573,615,000		2,573,615,000				2,776,699,000
Non-Accrual Loans	16,817,000		16,817,000				2,329,000
Commercial and industrial loans | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,667,000		2,667,000				5,866,000
Commercial and industrial loans | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	507,000		507,000				6,571,000
Commercial and industrial loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,330,000		16,330,000				2,789,000
Increase (decrease) in past due loans			(13,500,000)
Non-Accrual Loans	$ 11,400,000		$ 11,400,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of troubled debt restructured loans	9990.00%		9230.00%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,154,373,000		$ 1,154,373,000				1,234,741,000
Non-Accrual Loans	5,556,000		5,556,000				6,517,000
Mortgage loans with formal foreclosure proceedings	3,900,000	$ 5,100,000	3,900,000	$ 5,100,000
Residential | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,982,000		2,982,000				3,269,000
Residential | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,195,000		1,195,000				1,429,000
Residential | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,231,000		$ 2,231,000				$ 3,264,000