Allowance for Credit Losses (Narrative) (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Sep. 30, 2021 USD ($) risk_code	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) risk_code	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Length of time projected by model							10 years
Interest Income on Non-Accrual Loans and Leases | $					$ 0	$ 0	$ 0	$ 0
Days Past Due on Leases and Equipment Finance							181 days
Loans Deferred Under CARES Act | $					132,500		$ 132,500		$ 355,500
GNMA repurchased loans on deferral | $					121,000		121,000		177,700
Total troubled debt restructurings, net of deferred fees and costs | $					$ 9,800		$ 9,800		$ 15,000
Minimum Collateral Value compared to Secured Loan (Percent)					100.00%		100.00%
qualitative overlay adjustments | $					$ 16,900		$ 16,900
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
qualitative overlay adjustments | $					$ 13,800		$ 13,800
Moody's Analytics' August consensus
Financing Receivable, Allowance for Credit Loss [Line Items]
Real GDP Growth					4.90%
Unemployment Rate					5.50%
Moody's Analytics' August S2
Financing Receivable, Allowance for Credit Loss [Line Items]
Real GDP Growth					3.50%
Unemployment Rate					5.90%
Probability economy performs better than scenario					75.00%
Probability economy performs worse than scenario					25.00%
Non homogeneous
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Threshold Period Past Due					90 days		90 days
Pass | Non homogeneous | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					1		1
Pass | Non homogeneous | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					9		9
Watch | Non homogeneous | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					10		10
Watch | Non homogeneous | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					11		11
Special mention | Non homogeneous
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					12		12
Substandard | Non homogeneous | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					13		13
Substandard | Non homogeneous | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					14		14
Doubtful | Non homogeneous
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					15		15
Loss | Non homogeneous
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					16		16
Loss | Non homogeneous | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Internal risk rating code (number)					16		16
Expected | Moody's Analytics' August consensus
Financing Receivable, Allowance for Credit Loss [Line Items]
Unemployment Rate				4.20%
Expected | Moody's Analytics' August S2
Financing Receivable, Allowance for Credit Loss [Line Items]
Unemployment Rate			5.00%
Fed Funds Rate	0.00%
Expected | Minimum | Moody's Analytics' August consensus
Financing Receivable, Allowance for Credit Loss [Line Items]
Fed Funds Rate		0.00%
Expected | Maximum | Moody's Analytics' August consensus
Financing Receivable, Allowance for Credit Loss [Line Items]
Fed Funds Rate		0.25%