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Stockholders' Equity and Regulatory Capital Reconciliation of stockholders' equity to federal regulatory capital (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Stockholders’ equity of the Corporation	$ 289,588	$ 260,640	$ 232,422	$ 206,162
Net unrealized and accumulated losses on specific items	13,717	15,310
Disallowed servicing assets	(614)	(706)
Disallowed goodwill and other intangibles	(10,368)	(10,401)
Equity Impact of ASC 326 Phase-in	1,015	0
Tier 1 capital	293,338	264,843
Allowable general valuation allowances and subordinated debt	82,102	59,050
Total capital	$ 375,440	$ 323,893

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