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Note 7 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

		*September 30, 2025*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		($ In thousands)
Securities AFS
U.S. treasury securities		$	776,501			$	342			$	10			$	776,833
U.S. government agency entities			6,928				51				119				6,860
U.S. government sponsored entities			25,000				5				—				25,005
Mortgage-backed securities			726,456				511				81,392				645,575
Collateralized mortgage obligations			25,171				—				1,869				23,302
Corporate debt securities			168,143				56				2,324				165,875
Total		$	1,728,199			$	965			$	85,714			$	1,643,450

		*December 31, 2024*
						*Gross*				*Gross*
		*Amortized*				*Unrealized*				*Unrealized*
		*Cost*				*Gains*				*Losses*				*Fair Value*
		($ In thousands)
Securities AFS
U.S. treasury securities		$	621,212			$	250			$	—			$	621,462
U.S. government agency entities			9,226				50				127				9,149
Mortgage-backed securities			797,145				67				113,196				684,016
Collateralized mortgage obligations			27,747				—				3,191				24,556
Corporate debt securities			213,331				145				5,531				207,945
Total		$	1,668,661			$	512			$	122,045			$	1,547,128

Investments Classified by Contractual Maturity Date [Table Text Block]

		*September 30, 2025*
		*Securities AFS*
		*Amortized Cost*				*Fair Value*
		($ In thousands)

Due in one year or less		$	906,650			$	905,081
Due after one year through five years			92,523				91,193
Due after five years through ten years			73,209				69,702
Due after ten years			655,817				577,474
Total		$	1,728,199			$	1,643,450

Unrealized Gain (Loss) on Investments [Table Text Block]

		*September 30, 2025*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		($ In thousands)

Securities AFS
U.S. treasury securities		$	108,009			$	10			$	—			$	—			$	108,009			$	10
U.S. government agency entities			4,295				9				2,495				110				6,790				119
Mortgage-backed securities			240				—				629,714				81,392				629,954				81,392
Collateralized mortgage obligations			—				—				23,302				1,869				23,302				1,869
Corporate debt securities			9,930				69				105,889				2,255				115,819				2,324
Total		$	122,474			$	88			$	761,400			$	85,626			$	883,874			$	85,714

		*December 31, 2024*
		*Less than 12 Months*								*12 Months or Longer*								*Total*
						*Gross*								*Gross*								*Gross*
		*Fair*				*Unrealized*				*Fair*				*Unrealized*				*Fair*				*Unrealized*
		*Value*				*Losses*				*Value*				*Losses*				*Value*				*Losses*
		($ In thousands)

Securities AFS
U.S. government agency entities		$	4,199			$	8			$	2,108			$	119			$	6,307			$	127
Mortgage-backed securities			29,955				959				653,236				112,237				683,191				113,196
Collateralized mortgage obligations			—				—				24,556				3,191				24,556				3,191
Corporate debt securities			24,900				100				127,744				5,431				152,644				5,531
Total		$	59,054			$	1,067			$	807,644			$	120,978			$	866,698			$	122,045