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Loans and Allowance - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 01, 2021	Dec. 31, 2020
Receivables [Abstract]
Loans held for sale	$ 4,430,000			$ 3,966,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,318,228,000			9,243,174,000
Interest income recognized on non-accrual loans	0	$ 0
Allowance for credit losses on unfunded loan commitments	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
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,178,832,000			2,220,949,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,876,212,000			2,776,699,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,239,925,000			1,234,741,000
Percentage of troubled debt restructured loans	6400.00%
Mortgage loans with formal foreclosure proceedings	$ 3,300,000	$ 507,000
PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	741,700,000			667,100,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	55,622,000			19,638,000
Increase (decrease) in past due loans	(36,000,000.0)
30-59 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	45,942,000			2,525,000
30-59 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	4,545,000			5,866,000
30-59 Days Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,582,000			3,269,000
30-59 Days Past Due | Multifamily | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	24,100,000
30-59 Days Past Due | Hotel | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	21,000,000.0
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	2,978,000			11,187,000
Increase (decrease) in past due loans	8,200,000
60-89 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	434,000			2,109,000
60-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	19,000			6,571,000
Increase (decrease) in past due loans	(5,000,000.0)
60-89 Days Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	377,000			1,429,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	47,390,000			41,950,000
Increase (decrease) in past due loans	(5,400,000)
90 Days or More Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	38,353,000			31,634,000
Increase (decrease) in past due loans	3,700,000
90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	1,212,000			2,789,000
90 Days or More Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due	3,493,000			$ 3,264,000
90 Days or More Past Due | Nursing Home | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in past due loans	$ (13,000,000.0)

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