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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of Available-for-Sale Securities
The amortized cost, gross unrealized gains and losses, allowance for credit losses and the fair value of the Company's available for sale securities are as follows:
 June 30, 2023
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. Treasury and U.S. government agencies$359,909 $105 $(26,323)$— $333,691 
Mortgage-backed securities, residential337,275 — (39,471)— 297,804 
Collateralized mortgage obligations, residential160,507 — (16,070)— 144,437 
Mortgage-backed securities, multifamily989 — (221)— 768 
Collateralized mortgage obligations, multifamily50,183 — (4,846)— 45,337 
Asset-backed securities48,566 14 (1,117)— 47,463 
Obligations of states and political subdivisions21,875 — (838)— 21,037 
Corporate bonds115,651 — (17,215)— 98,436 
Total$1,094,955 $119 $(106,101)$— $988,973 
 December 31, 2022
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. Treasury and U.S. government agencies$383,958 $100 $(28,419)$— $355,639 
Mortgage-backed securities, residential351,355 6 (40,748)— 310,613 
Collateralized mortgage obligations, residential170,502 — (16,444)— 154,058 
Mortgage-backed securities, multifamily1,000 — (215)— 785 
Collateralized mortgage obligations, multifamily51,108 — (4,775)— 46,333 
Asset-backed securities54,105 — (1,710)— 52,395 
Obligations of states and political subdivisions22,112 — (989)(1)21,122 
Corporate bonds124,394 — (10,718)(309)113,367 
Total$1,158,534 $106 $(104,018)$(310)$1,054,312 
Reconciliation of Held-to-Maturity Securities
The amortized cost, gross unrealized gains and losses, allowance for credit losses and the fair value of the Company's held to maturity investment securities are as follows:
 June 30, 2023
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. government agencies$10,765 $10 $(699)$— $10,076 
Mortgage-backed securities, residential347,134 31 (56,223)— 290,942 
Collateralized mortgage obligations, residential12,661 — (2,586)— 10,075 
Mortgage-backed securities, multifamily5,048 — (741)— 4,307 
Obligations of states and political subdivisions500,644 18 (87,438)(25)413,199 
Corporate bonds3,000 — (673)(121)2,206 
Total$879,252 $59 $(148,360)$(146)$730,805 
 December 31, 2022
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. government agencies$11,099 $11 $(725)$— $10,385 
Mortgage-backed securities, residential360,683 57 (58,128)— 302,612 
Collateralized mortgage obligations, residential13,026 — (2,570)— 10,456 
Mortgage-backed securities, multifamily5,094 — (747)— 4,347 
Obligations of states and political subdivisions530,513 2 (100,400)(7)430,108 
Corporate bonds3,000 — (353)(100)2,547 
Total$923,415 $70 $(162,923)$(107)$760,455 
Summary of Investment Securities by Stated Maturity
The following table lists contractual maturities of investment securities classified as available for sale and held to maturity as of June 30, 2023. Mortgage-backed and asset-backed securities are not shown by maturity because expected maturities may differ from contractual maturities due to underlying loan prepayments of the issuer. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 Available for SaleHeld to Maturity
(in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$43,295 $42,447 $40,956 $40,835 
Due after one year through five years245,438 228,532 34,856 32,895 
Due after five years through ten years148,560 127,771 85,531 73,664 
Due after ten years60,142 54,414 353,066 278,087 
497,435 453,164 514,409 425,481 
Mortgage-backed and asset-backed securities597,520 535,809 364,843 305,324 
Total$1,094,955 $988,973 $879,252 $730,805 
Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position
The following tables indicate the length of time individual securities have been in a continuous unrealized loss position for the periods presented:
June 30, 2023Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Number of
Securities		Fair ValueUnrealized
Losses
Available for Sale
U.S. Treasury and U.S. government agencies
$13,654 $26 $306,321 $26,297 60 $319,975 $26,323 
Mortgage-backed securities, residential6,258 393 291,546 39,078 134 297,804 39,471 
Collateralized mortgage obligations, residential8,929 505 135,508 15,565 100 144,437 16,070 
Mortgage-backed securities, multifamily— — 768 221 1 768 221 
Collateralized mortgage obligations, multifamily7 — 45,330 4,846 20 45,337 4,846 
Asset-backed securities
— — 44,361 1,117 14 44,361 1,117 
Obligations of states and political subdivisions
2,055 45 18,242 793 45 20,297 838 
Corporate bonds8,651 1,349 89,784 15,866 47 98,435 17,215 
Total$39,554 $2,318 $931,860 $103,783 421 $971,414 $106,101 
Held to Maturity
U.S. government agencies$— $— $8,897 $699 3 $8,897 $699 
Mortgage-backed securities, residential22,367 1,160 264,797 55,063 187 287,164 56,223 
Collateralized mortgage obligations, residential— — 10,075 2,586 11 10,075 2,586 
Mortgage-backed securities, multifamily— — 4,307 741 4 4,307 741 
Obligations of states and political subdivisions
34,249 155 372,367 87,283 357 406,616 87,438 
Corporate bonds— — 2,327 673 1 2,327 673 
Total$56,616 $1,315 $662,770 $147,045 563 $719,386 $148,360 
December 31, 2022Less Than 12 Months12 Months or LongerTotal
(dollars in thousands)Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Number of
Securities		Fair ValueUnrealized
Losses
Available for Sale
U.S. Treasury and U.S. government agencies
$114,514 $5,856 $229,094 $22,563 67 $343,608 $28,419 
Mortgage-backed securities, residential127,363 12,399 182,079 28,349 135 309,442 40,748 
Collateralized mortgage obligations, residential66,316 3,958 87,742 12,486 104 154,058 16,444 
Mortgage-backed securities, multifamily— — 786 215 1 786 215 
Collateralized mortgage obligations, multifamily37,407 2,861 8,926 1,914 20 46,333 4,775 
Asset-backed securities
34,871 977 17,524 733 17 52,395 1,710 
Obligations of states and political subdivisions
3,771 276 16,746 713 46 20,517 989 
Corporate bonds88,489 7,437 22,880 3,281 49 111,369 10,718 
Total$472,731 $33,764 $565,777 $70,254 439 $1,038,508 $104,018 
Held to Maturity
U.S. government agencies$6,671 $336 $2,412 $389 3 $9,083 $725 
Mortgage-backed securities, residential$32,549 $2,275 $264,035 $55,853 182 $296,584 $58,128 
Collateralized mortgage obligations, residential4,668 516 5,787 2,054 12 10,455 2,570 
Mortgage-backed securities, multifamily2,671 376 1,676 371 4 4,347 747 
Obligations of states and political subdivisions
82,459 3,689 341,076 96,711 379 423,535 100,400 
Corporate bonds— — 2,647 353 1 2,647 353 
Total$129,018 $7,192 $617,633 $155,731 581 $746,651 $162,923 
Debt Securities, Held-to-maturity, Credit Quality Indicator
The tables below indicate the credit profile of the Company's held to maturity investment securities at amortized cost:
June 30, 2023 AAA  AA  A  BBB  Not Rated  Total
(in thousands)
U.S. government agencies$10,765 $— $— $— $— $10,765 
Mortgage-backed securities, residential347,134 — — — — 347,134 
Collateralized mortgage obligations, residential12,661 — — — — 12,661 
Mortgage-backed securities, multifamily5,048 — — — — 5,048 
Obligations of states and political subdivisions153,506 313,581 — — 33,557 500,644 
Corporate bonds— — — 3,000 — 3,000 
Total$529,114 $313,581 $— $3,000 $33,557 $879,252 
December 31, 2022 AAA  AA  A  BBB  Not Rated  Total
(in thousands)
U.S. government agencies$11,099 $— $— $— $— $11,099 
Mortgage-backed securities, residential360,683 — — — — 360,683 
Collateralized mortgage obligations, residential13,026 — — — — 13,026 
Mortgage-backed securities, multifamily5,094 — — — — 5,094 
Obligations of states and political subdivisions156,661 317,566 1,020 — 55,266 530,513 
Corporate bonds— — — 3,000 — 3,000 
Total$546,563 $317,566 $1,020 $3,000 $55,266 $923,415