Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022 and 2021.

	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, 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	%
As of December 31, 2021:
Tier 1 Capital (to Average- Assets)
Company	$	1,406,434		9.18	%	$	613,072	≥		4.00	%				N/A
Bank	$	1,363,879		8.90	%	$	612,983	≥		4.00	%	$	766,229	≥		5.00	%
Common equity Tier 1 capital ratio
Company	$	1,406,434		14.86	%	$	662,520	≥		7.00	%				N/A
Bank	$	1,363,879		14.41	%	$	662,494	≥		7.00	%	$	615,173	≥		6.50	%
Tier 1 Capital (to Risk-Weighted Assets)
Company	$	1,406,434		14.86	%	$	804,489	≥		8.50	%				N/A
Bank	$	1,363,879		14.41	%	$	804,457	≥		8.50	%	$	757,136	≥		8.00	%
Total Capital (to Risk-Weighted Assets)
Company	$	1,479,453		15.63	%	$	993,780	≥		10.50	%				N/A
Bank	$	1,436,989		15.18	%	$	993,741	≥		10.50	%	$	946,420	≥		10.00	%