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Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0
Debt Securities, Available-for-sale, Amortized Cost	1,800,956,000		$ 1,727,363,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0		0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Debt Securities, Available for Sale, Sold at Gain, Amortized Cost Amount	$ 0	$ 0
Debt Securities, Available-for-sale	1,757,147,000		1,754,140,000
Debt Securities, Available-for-sale, Unrealized Loss Position	1,296,490,000		840,832,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	51,691,000		9,514,000
Securities Available-for-Sale, 12 months or longer, Fair value	149,376,000		73,431,000
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	870,576,000		849,114,000
Debt Securities, Available-for-sale	834,802,000		854,463,000
Debt Securities, Available-for-sale, Unrealized Loss Position	681,882,000		407,084,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	36,959,000		8,088,000
Securities Available-for-Sale, 12 months or longer, Fair value	149,376,000		73,431,000
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 690,400,000		$ 733,700,000

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