Securities (Schedule of Held-to-maturity, Unrealized Loss on Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Held-to-maturity:
Less than 12 Months, Fair Value		$ 198,501
Less than 12 Months, Gross Unrealized Losses		$ (14,503)
Less than 12 Months, Number of Securities		35
12 Months or Greater, Fair Value	$ 256,325	$ 62,111
12 Months or Greater, Gross Unrealized Losses	$ (25,988)	$ (10,833)
12 Months or Greater, Number of Securities	57	22
Total, Fair Value	$ 256,325	$ 260,612
Total, Gross Unrealized Losses	$ (25,988)	$ (25,336)
Total, Number of Securities	57	57
US Treasury Securities [Member]
Held-to-maturity:
Less than 12 Months, Fair Value		$ 144,683
Less than 12 Months, Gross Unrealized Losses		$ (5,613)
Less than 12 Months, Number of Securities		4
12 Months or Greater, Fair Value	$ 147,201
12 Months or Greater, Gross Unrealized Losses	$ (2,925)
12 Months or Greater, Number of Securities	4
Total, Fair Value	$ 147,201	$ 144,683
Total, Gross Unrealized Losses	$ (2,925)	$ (5,613)
Total, Number of Securities	4	4
US Government-sponsored Enterprises Debt Securities [Member]
Held-to-maturity:
Less than 12 Months, Fair Value		$ 13,048
Less than 12 Months, Gross Unrealized Losses		$ (2,503)
Less than 12 Months, Number of Securities		3
12 Months or Greater, Fair Value	$ 40,629	$ 29,451
12 Months or Greater, Gross Unrealized Losses	$ (9,013)	$ (5,534)
12 Months or Greater, Number of Securities	13	10
Total, Fair Value	$ 40,629	$ 42,499
Total, Gross Unrealized Losses	$ (9,013)	$ (8,037)
Total, Number of Securities	13	13
Municipal securities [Member]
Held-to-maturity:
Less than 12 Months, Fair Value		$ 40,770
Less than 12 Months, Gross Unrealized Losses		$ (6,387)
Less than 12 Months, Number of Securities		28
12 Months or Greater, Fair Value	$ 44,076	$ 5,375
12 Months or Greater, Gross Unrealized Losses	$ (8,872)	$ (1,163)
12 Months or Greater, Number of Securities	35	7
Total, Fair Value	$ 44,076	$ 46,145
Total, Gross Unrealized Losses	$ (8,872)	$ (7,550)
Total, Number of Securities	35	35
Mortgage-backed securities (GSEs) [Member]
Held-to-maturity:
12 Months or Greater, Fair Value	$ 24,419	$ 27,285
12 Months or Greater, Gross Unrealized Losses	$ (5,178)	$ (4,136)
12 Months or Greater, Number of Securities	5	5
Total, Fair Value	$ 24,419	$ 27,285
Total, Gross Unrealized Losses	$ (5,178)	$ (4,136)
Total, Number of Securities	5	5