Loans (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	18 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jun. 30, 2021	Apr. 01, 2019	Jul. 01, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivables, Gross Contractual Amount							$ 589,700,000	$ 277,900,000
Loans and Leases Receivable, Deferred Income	$ 26,800,000		$ 26,800,000		$ 23,600,000	$ 26,800,000
Impaired Financing Receivable, Related Allowance					5,434,000
Troubled Debt Restructuring Included In Nonaccrual Loans	21,300,000		21,300,000		25,800,000	21,300,000
TDRs included in accruing loan totals	17,400,000		17,400,000		20,900,000	17,400,000
Nonaccrual Trouble Debt Restructuring Current	11,200,000		11,200,000		12,900,000	11,200,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	8,400,000		8,400,000		6,700,000	8,400,000
Specific reserves related to troubled debt restructuring	300,000		300,000		200,000	300,000
Additional Specific Reserves Related To Troubled Debt Restructuring		$ 18,000	18,000	$ 0
Loan Modifications on Nonacrrual status	600,000	43,000	$ 1,600,000	300,000
Loan past due period before entering default status			30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	700,000	4,600,000	$ 1,100,000	4,700,000
Deposit Liabilities Reclassified as Loans Receivable	1,500,000		1,500,000		2,000,000.0	1,500,000
PPP loans originated [Line Items]			248,900,000		331,600,000
SBA Fees received					20,200,000
SBA PPP Fees recognized	5,000,000.0	2,800,000	9,600,000	2,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables							578,600,000	272,800,000
Goodwill, Purchase Accounting Adjustments			5,600,000		7,200,000
Troubled Debt Restructuring, Classification removed	0	884,000	3,900,000	884,000
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase			52,000
PPP Round 2
Financing Receivable, Credit Quality Indicator [Line Items]
SBA Fees received			12,900,000
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Related Allowance					1,316,000
PPP loans receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Deferred Income	9,300,000		9,300,000		6,500,000	9,300,000
Accruing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period	44,000	4,200,000	84,000	4,200,000
Nonaccrual [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans modified during period	600,000	400,000	1,000,000.0	500,000
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	2,700,000	39,400,000	3,700,000	45,300,000
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 100,000	0	$ 200,000
Financing Receivables, COVID Modifications, Recorded Investment, During Period						546,200,000
Commercial Portfolio Segment [Member] | Covid Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period						436,000
Commercial Portfolio Segment [Member] | Other Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period						6,200,000
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period						87,100,000
Consumer Loan [Member] | Covid Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period						960,000
Consumer Loan [Member] | Other Restructuring [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivables, COVID Modifications, Recorded Investment, During Period			1,900,000
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Business Combination, Acquired Receivable, Fair Value	$ 10,000,000.0		$ 10,000,000.0		$ 11,200,000	$ 10,000,000.0	18,400,000	4,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount							$ 19,900,000	$ 5,100,000