Investment Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investment Securities

Schedule of amortized cost of investment securities to estimated fair values

	December 31, 2021
	Amortized		Unrealized		Unrealized		Fair
(dollars in thousands)	Cost		Gains		Losses		Value
Available-for-sale
U.S. Treasury and agencies	$	5,028	$	75	$	—	$	5,103
Mortgage backed securities
Residential agency		717,781		1,213		(11,837)		707,157
Commercial		88,362		2,674		(123)		90,913
Asset backed securities		52		2		—		54
Corporate bonds		49,035		1,398		(11)		50,422
Total available-for-sale investment securities		860,258		5,362		(11,971)		853,649
Held-to-maturity
Obligations of state and political agencies		144,543		1,110		(349)		145,304
Mortgage backed securities
Residential agency		207,518		—		(3,145)		204,373
Total held-to-maturity investment securities		352,061		1,110		(3,494)		349,677
Total investment securities	$	1,212,319	$	6,472	$	(15,465)	$	1,203,326

	December 31, 2020
	Amortized		Unrealized		Unrealized		Fair
(dollars in thousands)	Cost		Gains		Losses		Value
Available-for-sale
U.S. Treasury and agencies	$	5,926	$	—	$	(19)	$	5,907
Obligations of state and political agencies		148,491		5,282		—		153,773
Mortgage backed securities
Residential agency		303,760		3,395		(436)		306,719
Commercial		89,300		5,678		—		94,978
Asset backed securities		109		6		—		115
Corporate bonds		30,552		388		(90)		30,850
Total available-for-sale investment securities	$	578,138	$	14,749	$	(545)	$	592,342

Schedule of contractual maturity of amortized cost and estimated fair value

	Held-to-maturity				Available-for-sale
	Carrying		Fair		Amortized		Fair
(dollars in thousands)	Value		Value		Cost		Value
Due within one year or less	$	4,819	$	4,817	$	2	$	2
Due after one year through five years		34,896		34,769		2,809		2,883
Due after five years through ten years		74,002		74,581		96,263		99,243
Due after 10 years		238,344		235,510		761,184		751,521
Total investment securities	$	352,061	$	349,677	$	860,258	$	853,649

Schedule of proceeds from the sale of available for sale securities

	Year ended
	December 31,
(dollars in thousands)	2021		2020		2019
Proceeds	$	13,189	$	75,647	$	32,565
Realized gains		114		2,737		357
Realized losses		—		—		(22)

Schedule of investment securities with gross unrealized losses

	December 31, 2021
	Less than 12 Months				Over 12 Months				Total
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(dollars in thousands)	Losses		Value		Losses		Value		Losses		Value
Available-for-sale
U.S. Treasury and agencies	$	—	$	—	$	—	$	—	$	—	$	—
Mortgage backed securities
Residential agency		(10,156)		554,811		(1,681)		55,082		(11,837)		609,893
Commercial		(123)		17,470		—		—		(123)		17,470
Asset backed securities		—		—		—		2		—		2
Corporate bonds		(11)		5,989		—		—		(11)		5,989
Total available-for-sale investment securities		(10,290)		578,270		(1,681)		55,084		(11,971)		633,354
Held-to-maturity
Obligations of state and political agencies		(349)		53,210		—		—		(349)		53,210
Mortgage backed securities
Residential agency		(3,145)		204,373		—		—		(3,145)		204,373
Total held-to-maturity investment securities		(3,494)		257,583		—		—		(3,494)		257,583
Total investment securities	$	(13,784)	$	835,853	$	(1,681)	$	55,084	$	(15,465)	$	890,937

	December 31, 2020
	Less than 12 Months				Over 12 Months				Total
	Unrealized		Fair		Unrealized		Fair		Unrealized		Fair
(dollars in thousands)	Losses		Value		Losses		Value		Losses		Value
Available-for-sale
U.S. Treasury and agencies	$	(10)	$	4,509	$	(9)	$	1,309	$	(19)	$	5,818
Obligations of state and political agencies		—		—		—		—		—		—
Mortgage backed securities
Residential agency		(432)		68,494		(4)		2,356		(436)		70,850
Commercial		—		—		—		—		—		—
Asset backed securities		—		—		—		2		—		2
Corporate bonds		(90)		16,454		—		—		(90)		16,454
Total available-for-sale investment securities	$	(532)	$	89,457	$	(13)	$	3,667	$	(545)	$	93,124

Schedule of federal home loan bank

	December 31,		December 31,
(dollars in thousands)	2021		2020
Federal Reserve	$	2,675	$	2,675
FHLB		3,806		3,090