Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Regulatory Capital Amounts and Ratios for Company and Bank

The following table summarizes regulatory capital amounts and ratios for the Company and the Bank as of December 31, 2023 and 2022.

	Actual					Minimum Required Plus Capital Conservation Buffer						To Be Well Capitalized under Prompt Corrective Action Provisions
	Amount		Ratio			Amount			Ratio			Amount			Ratio
	(Dollars in thousands)
As of December 31, 2023:
Tier 1 Capital (to Average- Assets)
Company	$	1,626,626		10.27	%	$	633,372	>		4.00	%				N/A
Bank	$	1,610,514		10.17	%	$	633,582	>		4.00	%	$	791,978	>		5.00	%
Common equity Tier 1 capital ratio
Company	$	1,626,626		14.65	%	$	777,359	>		7.00	%				N/A
Bank	$	1,610,514		14.49	%	$	777,782	>		7.00	%	$	722,226	>		6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Company	$	1,626,626		14.65	%	$	943,936	>		8.50	%				N/A
Bank	$	1,610,514		14.49	%	$	944,450	>		8.50	%	$	888,894	>		8.00	%
Total Capital (to Risk-Weighted Assets)
Company	$	1,720,968		15.50	%	$	1,166,038	>		10.50	%				N/A
Bank	$	1,704,856		15.34	%	$	1,166,673	>		10.50	%	$	1,111,118	>		10.00	%
As of December 31, 2022:
Tier 1 Capital (to Average- Assets)
Company	$	1,525,162		9.53	%	$	639,881	≥		4.00	%				N/A
Bank	$	1,507,346		9.42	%	$	639,816	≥		4.00	%	$	799,769	≥		5.00	%
Common equity Tier 1 capital ratio
Company	$	1,525,162		13.55	%	$	788,184	≥		7.00	%				N/A
Bank	$	1,507,346		13.39	%	$	788,037	≥		7.00	%	$	731,748	≥		6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Company	$	1,525,162		13.55	%	$	957,080	≥		8.50	%				N/A
Bank	$	1,507,346		13.39	%	$	956,902	≥		8.50	%	$	900,614	≥		8.00	%
Total Capital (to Risk-Weighted Assets)
Company	$	1,618,279		14.37	%	$	1,182,276	≥		10.50	%				N/A
Bank	$	1,600,463		14.22	%	$	1,182,055	≥		10.50	%	$	1,125,767	≥		10.00	%