Investment Securities (Tables)

3 Months Ended

Mar. 31, 2023

Investment Securities [Abstract]

Amortized Cost and Estimated Fair Values of AFS Investment Securities

	March 31, 2023
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value
State and municipals	$	168,103	$	102	$	(12,437)	$	155,768
Pass-through mortgage securities		176,678		8		(28,560)		148,126
Collateralized mortgage obligations		131,660		—		(19,757)		111,903
SBA agency obligations		134,770		508		(614)		134,664
Corporate bonds		119,000		—		(14,842)		104,158
	$	730,211	$	618	$	(76,210)	$	654,619
	December 31, 2022
State and municipals	$	321,700	$	136	$	(16,589)	$	305,247
Pass-through mortgage securities		179,655		—		(31,135)		148,520
Collateralized mortgage obligations		134,070		—		(20,676)		113,394
Corporate bonds		119,000		—		(12,748)		106,252
	$	754,425	$	136	$	(81,148)	$	673,413

Securities with a Continuous Unrealized Loss Position

	March 31, 2023
	Less than				12 Months
	12 Months				or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Loss		Value		Loss		Value		Loss
State and municipals	$	71,383	$	(2,184)	$	68,032	$	(10,253)	$	139,415	$	(12,437)
Pass-through mortgage securities		4,235		(215)		139,792		(28,345)		144,027		(28,560)
Collateralized mortgage obligations		39,369		(851)		72,534		(18,906)		111,903		(19,757)
SBA agency obligations		88,657		(614)		—		—		88,657		(614)
Corporate bonds		—		—		104,158		(14,842)		104,158		(14,842)
Total temporarily impaired	$	203,644	$	(3,864)	$	384,516	$	(72,346)	$	588,160	$	(76,210)
	December 31, 2022
State and municipals	$	238,157	$	(12,047)	$	13,934	$	(4,542)	$	252,091	$	(16,589)
Pass-through mortgage securities		12,667		(979)		135,853		(30,156)		148,520		(31,135)
Collateralized mortgage obligations		42,560		(1,515)		70,834		(19,161)		113,394		(20,676)
Corporate bonds		—		—		106,252		(12,748)		106,252		(12,748)
Total temporarily impaired	$	293,384	$	(14,541)	$	326,873	$	(66,607)	$	620,257	$	(81,148)

Sales of Available-for-Sale Securities

	Three Months Ended
	March 31,
(in thousands)	2023		2022
Proceeds	$	145,451	$	—
Gains	$	—	$	—
Losses		(3,489)		—
Net loss	$	(3,489)	$	—

Maturities

(in thousands)	Amortized Cost		Fair Value
Within one year	$	15,183	$	15,144
After 1 through 5 years		8,997		8,708
After 5 through 10 years		191,377		175,530
After 10 years		113,454		102,786
Mortgage-backed securities		401,200		352,451
	$	730,211	$	654,619