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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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:
 March 31, 2023
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. Treasury and U.S. government agencies$372,114 $95 $(23,790)$— $348,419 
Mortgage-backed securities, residential344,792 6 (36,615)— 308,183 
Collateralized mortgage obligations, residential165,787 — (14,069)— 151,718 
Mortgage-backed securities, multifamily994 — (206)— 788 
Collateralized mortgage obligations, multifamily50,692 — (4,270)— 46,422 
Asset-backed securities50,826 — (1,577)— 49,249 
Obligations of states and political subdivisions21,993 — (701)(2)21,290 
Corporate bonds115,703 — (12,487)(158)103,058 
Total$1,122,901 $101 $(93,715)$(160)$1,029,127 
 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:
 March 31, 2023
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesFair
Value
U.S. government agencies$10,968 $10 $(622)$— $10,356 
Mortgage-backed securities, residential354,514 123 (52,843)— 301,794 
Collateralized mortgage obligations, residential12,813 — (2,325)— 10,488 
Mortgage-backed securities, multifamily5,071 — (665)— 4,406 
Obligations of states and political subdivisions516,289 4 (83,042)(45)433,206 
Corporate bonds3,000 — (418)(112)2,470 
Total$902,655 $137 $(139,915)$(157)$762,720 
 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 March 31, 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$42,276 $41,645 $54,927 $54,712 
Due after one year through five years250,381 235,641 33,746 32,297 
Due after five years through ten years155,291 139,130 77,738 68,421 
Due after ten years61,862 56,351 363,846 290,602 
509,810 472,767 530,257 446,032 
Mortgage-backed and asset-backed securities613,091 556,360 372,398 316,688 
Total$1,122,901 $1,029,127 $902,655 $762,720 
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:
March 31, 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
$13,915 $30 $319,832 $23,760 62 $333,747 $23,790 
Mortgage-backed securities, residential5,635 315 301,414 36,300 134 307,049 36,615 
Collateralized mortgage obligations, residential16,300 503 135,417 13,566 104 151,717 14,069 
Mortgage-backed securities, multifamily— — 788 206 1 788 206 
Collateralized mortgage obligations, multifamily10,716 141 35,706 4,129 20 46,422 4,270 
Asset-backed securities
3,316 13 45,933 1,564 17 49,249 1,577 
Obligations of states and political subdivisions
1,214 11 18,461 690 42 19,675 701 
Corporate bonds32,800 3,411 70,259 9,076 47 103,059 12,487 
Total$83,896 $4,424 $927,810 $89,291 427 $1,011,706 $93,715 
Held to Maturity
U.S. government agencies$— $— $9,115 $622 3 $9,115 $622 
Mortgage-backed securities, residential20,853 849 274,937 51,994 183 295,790 52,843 
Collateralized mortgage obligations, residential— — 10,488 2,325 11 10,488 2,325 
Mortgage-backed securities, multifamily— — 4,406 665 4 4,406 665 
Obligations of states and political subdivisions
49,185 177 379,143 82,865 366 428,328 83,042 
Corporate bonds— — 2,582 418 1 2,582 418 
Total$70,038 $1,026 $680,671 $138,889 568 $750,709 $139,915 
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 
Collateralized mortgage obligations, 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 
Debt securities
— — 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:
March 31, 2023 AAA  AA  A  BBB  Not Rated  Total
(in thousands)
U.S. government agencies$10,968 $— $— $— $— $10,968 
Mortgage-backed securities, residential354,514 — — — — 354,514 
Collateralized mortgage obligations, residential12,813 — — — — 12,813 
Mortgage-backed securities, multifamily5,071 — — — — 5,071 
Obligations of states and political subdivisions154,133 315,110 1,008 — 46,038 516,289 
Corporate bonds— — — 3,000 — 3,000 
Total$537,499 $315,110 $1,008 $3,000 $46,038 $902,655 
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