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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Available for Sale
The amortized cost, gross unrealized gains and losses and fair value of available for sale debt securities at March 31, 2023 and December 31, 2022 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
March 31, 2023
U.S. Treasury securities$309,524 $— $(22,779)$286,745 
U.S. government agency securities28,394 46 (2,088)26,352 
Obligations of states and political subdivisions:
Obligations of states and state agencies10,649 — (652)9,997 
Municipal bonds171,219 — (28,441)142,778 
Total obligations of states and political subdivisions181,868 — (29,093)152,775 
Residential mortgage-backed securities699,214 60 (79,498)619,776 
Corporate and other debt securities193,007 — (19,419)173,588 
Total $1,412,007 $106 $(152,877)$1,259,236 
December 31, 2022
U.S. Treasury securities$308,137 $— $(28,639)$279,498 
U.S. government agency securities29,494 47 (2,577)26,964 
Obligations of states and political subdivisions:
Obligations of states and state agencies10,899 — (493)10,406 
Municipal bonds171,586 — (35,181)136,405 
Total obligations of states and political subdivisions182,485 — (35,674)146,811 
Residential mortgage-backed securities719,868 64 (90,114)629,818 
Corporate and other debt securities197,927 — (19,621)178,306 
Total$1,437,911 $111 $(176,625)$1,261,397 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of the related available for sale debt securities at March 31, 2023 and December 31, 2022 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
March 31, 2023
U.S. Treasury securities$286,745 $(22,779)$— $— $286,745 $(22,779)
U.S. government agency securities12,003 (1,238)11,371 (850)23,374 (2,088)
Obligations of states and political subdivisions:
Obligations of states and state agencies
2,231 (17)7,766 (635)9,997 (652)
Municipal bonds114,299 (20,463)28,229 (7,978)142,528 (28,441)
Total obligations of states and political subdivisions
116,530 (20,480)35,995 (8,613)152,525 (29,093)
Residential mortgage-backed securities34,170 (1,506)582,739 (77,992)616,909 (79,498)
Corporate and other debt securities108,625 (9,446)64,964 (9,973)173,589 (19,419)
Total$558,073 $(55,449)$695,069 $(97,428)$1,253,142 $(152,877)
December 31, 2022
U.S. Treasury securities$279,498 $(28,639)$— $— $279,498 $(28,639)
U.S. government agency securities22,831 (2,538)1,116 (39)23,947 (2,577)
Obligations of states and political subdivisions:
Obligations of states and state agencies
2,943 (54)7,462 (439)10,405 (493)
Municipal bonds112,029 (26,044)24,127 (9,137)136,156 (35,181)
Total obligations of states and political subdivisions
114,972 (26,098)31,589 (9,576)146,561 (35,674)
Residential mortgage-backed securities311,836 (27,152)314,834 (62,962)626,670 (90,114)
Corporate and other debt securities144,924 (12,581)33,382 (7,040)178,306 (19,621)
Total$874,061 $(97,008)$380,921 $(79,617)$1,254,982 $(176,625)
Contractual Maturities of Debt Securities Available for Sale The contractual maturities of available for sale debt securities at March 31, 2023 are set forth in the following table. Maturities may differ from contractual maturities in residential mortgage-backed securities because the mortgages underlying the securities may be prepaid without any penalties. Therefore, residential mortgage-backed securities are not included in the maturity categories in the following summary.
 March 31, 2023
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$3,852 $3,834 
Due after one year through five years282,224 270,503 
Due after five years through ten years173,459 154,742 
Due after ten years253,258 210,381 
Residential mortgage-backed securities699,214 619,776 
Total $1,412,007 $1,259,236 
Debt Securities, Available-for-Sale, Allowance for Credit Loss
The following table details the activity in the allowance for credit losses for the three months ended March 31, 2023.
Three Months Ended
March 31, 2023
(in thousands)
Beginning balance$— 
Provision for credit losses5,000 
Charge-offs(5,000)
Ending balance$— 
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Held to Maturity
The amortized cost, gross unrealized gains and losses and fair value of debt securities held to maturity at March 31, 2023 and December 31, 2022 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueAllowance for Credit LossesNet Carrying Value
 (in thousands)
March 31, 2023
U.S. Treasury securities$66,747 $— $(565)$66,182 $— $66,747 
U.S. government agency securities300,614 25 (44,999)255,640 — 300,614 
Obligations of states and political subdivisions:
Obligations of states and state agencies96,693 341 (4,149)92,885 257 96,436 
Municipal bonds376,904 112 (16,982)360,034 86 376,818 
Total obligations of states and political subdivisions473,597 453 (21,131)452,919 343 473,254 
Residential mortgage-backed securities2,893,505 2,752 (370,689)2,525,568 — 2,893,505 
Trust preferred securities37,048 1 (7,057)29,992 775 36,273 
Corporate and other debt securities75,701 — (5,518)70,183 515 75,186 
Total $3,847,212 $3,231 $(449,959)$3,400,484 $1,633 $3,845,579 
December 31, 2022
U.S. Treasury securities$66,911 $— $(1,022)$65,889 $— $66,911 
U.S. government agency securities260,392 — (47,680)212,712 — 260,392 
Obligations of states and political subdivisions:
Obligations of states and state agencies99,238 305 (3,869)95,674 252 98,986 
Municipal bonds381,060 76 (23,615)357,521 41 381,019 
Total obligations of states and political subdivisions480,298 381 (27,484)453,195 293 480,005 
Residential mortgage-backed securities2,909,106 1,723 (415,032)2,495,797 — 2,909,106 
Trust preferred securities37,043 1 (5,938)31,106 888 36,155 
Corporate and other debt securities75,234 — (4,463)70,771 465 74,769 
Total $3,828,984 $2,105 $(501,619)$3,329,470 $1,646 $3,827,338 
Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity
The age of unrealized losses and fair value of related debt securities held to maturity at March 31, 2023 and December 31, 2022 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
March 31, 2023
U.S. Treasury securities$66,182 $(565)$— $— $66,182 $(565)
U.S. government agency securities211,526 (44,773)2,925 (226)214,451 (44,999)
Obligations of states and political subdivisions:
Obligations of states and state agencies
20,457 (789)39,627 (3,360)60,084 (4,149)
Municipal bonds226,278 (13,671)26,411 (3,311)252,689 (16,982)
Total obligations of states and political subdivisions
246,735 (14,460)66,038 (6,671)312,773 (21,131)
Residential mortgage-backed securities
381,802 (33,941)1,944,360 (336,748)2,326,162 (370,689)
Trust preferred securities— — 28,990 (7,057)28,990 (7,057)
Corporate and other debt securities37,579 (2,122)24,604 (3,396)62,183 (5,518)
Total$943,824 $(95,861)$2,066,917 $(354,098)$3,010,741 $(449,959)
December 31, 2022
U.S. Treasury securities$65,889 $(1,022)$— $— $65,889 $(1,022)
U.S. government agency securities209,863 (47,508)1,673 (172)211,536 (47,680)
Obligations of states and political subdivisions:
Obligations of states and state agencies62,443 (2,020)18,231 (1,849)80,674 (3,869)
Municipal bonds251,970 (20,457)15,534 (3,158)267,504 (23,615)
Total obligations of states and political subdivisions
314,413 (22,477)33,765 (5,007)348,178 (27,484)
Residential mortgage-backed securities
962,690 (109,532)1,413,590 (305,500)2,376,280 (415,032)
Trust preferred securities— — 30,105 (5,938)30,105 (5,938)
Corporate and other debt securities
57,245 (2,989)13,525 (1,474)70,770 (4,463)
Total$1,610,100 $(183,528)$1,492,658 $(318,091)$3,102,758 $(501,619)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at March 31, 2023 are set forth in the table below. Maturities may differ from contractual maturities in residential mortgage-backed securities because the mortgages underlying the securities may be prepaid without any penalties. Therefore, residential mortgage-backed securities are not included in the maturity categories in the following summary.
 March 31, 2023
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$63,872 $63,355 
Due after one year through five years169,205 165,906 
Due after five years through ten years96,385 92,034 
Due after ten years624,245 553,621 
Residential mortgage-backed securities2,893,505 2,525,568 
Total$3,847,212 $3,400,484 
Amortized Cost of Debt Securities Held to Maturity by External Credit Rating The following table summarizes the amortized cost of held to maturity debt securities by external credit rating at March 31, 2023 and December 31, 2022.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
March 31, 2023
U.S. Treasury securities$66,747 $— $— $— $66,747 
U.S. government agency securities300,614 — — — 300,614 
Obligations of states and political subdivisions:
Obligations of states and state agencies73,278 — 5,437 17,978 96,693 
Municipal bonds328,202 — — 48,702 376,904 
Total obligations of states and political subdivisions
401,480 — 5,437 66,680 473,597 
Residential mortgage-backed securities2,893,505 — — — 2,893,505 
Trust preferred securities— — — 37,048 37,048 
Corporate and other debt securities— 6,000 — 69,701 75,701 
Total $3,662,346 $6,000 $5,437 $173,429 $3,847,212 
December 31, 2022
U.S. Treasury securities$66,911 $— $— $— $66,911 
U.S. government agency securities260,392 — — — 260,392 
Obligations of states and political subdivisions:
Obligations of states and state agencies74,943 — 5,497 18,798 99,238 
Municipal bonds333,488 — — 47,572 381,060 
Total obligations of states and political subdivisions
408,431 — 5,497 66,370 480,298 
Residential mortgage-backed securities2,909,106 — — — 2,909,106 
Trust preferred securities— — — 37,043 37,043 
Corporate and other debt securities2,000 6,000 — 67,234 75,234 
Total$3,646,840 $6,000 $5,497 $170,647 $3,828,984 
Debt Securities, Held-to-Maturity, Allowance for Credit Loss
The following table details the activity in the allowance for credit losses for the three months ended March 31, 2023 and 2022: 
Three Months Ended
March 31,
20232022
(in thousands)
Beginning balance$1,646 $1,165 
(Credit) provision for credit losses(13)57 
Ending balance$1,633 $1,222