Note 9 - Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

	At December 31, 2023					Required for Capital Adequacy Purposes					To Be Well-capitalized Under Prompt Corrective Action Regulations
	Amount		Ratio			Amount		Ratio			Amount		Ratio
	($ in thousands)
Common Equity Tier 1 Capital
Company	$	841,611		18.76	%	$	313,959		7.00	%		N/A		N/A
Bank		641,252		14.46	%		310,362		7.00	%	$	288,193		6.50	%
Tier 1 Capital
Company		841,611		18.76	%		381,236		8.50	%		N/A		N/A
Bank		641,252		14.46	%		376,868		8.50	%		354,700		8.00	%
Total Capital
Company		858,680		19.15	%		470,939		10.50	%		N/A		N/A
Bank		664,321		14.98	%		465,543		10.50	%		443,375		10.00	%
Leverage Ratio (1)
Company		841,611		12.86	%		261,739		4.00	%		N/A		N/A
Bank		641,252		9.88	%		259,617		4.00	%		324,521		5.00	%

	At December 31, 2022					Required for Capital Adequacy Purposes					To Be Well-capitalized Under Prompt Corrective Action Regulations
	Amount		Ratio			Amount		Ratio			Amount		Ratio
	($ in thousands)
Common Equity Tier 1 Capital
Company	$	736,414		15.22	%	$	338,748		7.00	%		N/A		N/A
Bank		592,804		12.37	%		335,351		7.00	%	$	311,397		6.50	%
Tier 1 Capital
Company		736,414		15.22	%		411,337		8.50	%		N/A		N/A
Bank		592,804		12.37	%		407,212		8.50	%		383,258		8.00	%
Total Capital
Company		756,900		15.64	%		508,123		10.50	%		N/A		N/A
Bank		619,290		12.93	%		503,026		10.50	%		479,073		10.00	%
Leverage Ratio (1)
Company		736,414		10.18	%		289,259		4.00	%		N/A		N/A
Bank		592,804		8.26	%		287,229		4.00	%		359,036		5.00	%