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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2023 and December 31, 2022 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
September 30, 2023
U.S. Treasury securities$312,348 $— $(36,600)$275,748 
U.S. government agency securities26,002 19 (3,450)22,571 
Obligations of states and political subdivisions:
Obligations of states and state agencies49,810 — (1,006)48,804 
Municipal bonds170,002 — (47,334)122,668 
Total obligations of states and political subdivisions219,812 — (48,340)171,472 
Residential mortgage-backed securities665,150 8 (111,731)553,427 
Corporate and other debt securities192,181 — (28,875)163,306 
Total $1,415,493 $27 $(228,996)$1,186,524 
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)$1,261,397 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of the related available for sale debt securities at September 30, 2023 and December 31, 2022 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
September 30, 2023
U.S. Treasury securities$— $— $275,748 $(36,600)$275,748 $(36,600)
U.S. government agency securities— — 21,216 (3,450)21,216 (3,450)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 8,189 (1,006)8,189 (1,006)
Municipal bonds1,012 (17)121,656 (47,317)122,668 (47,334)
Total obligations of states and political subdivisions
1,012 (17)129,845 (48,323)130,857 (48,340)
Residential mortgage-backed securities1,985 (19)550,953 (111,712)552,938 (111,731)
Corporate and other debt securities11,863 (1,137)151,443 (27,738)163,306 (28,875)
Total$14,860 $(1,173)$1,129,205 $(227,823)$1,144,065 $(228,996)
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 September 30, 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.
 September 30, 2023
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$1,574 $1,557 
Due after one year through five years288,843 270,859 
Due after five years through ten years173,478 144,436 
Due after ten years286,448 216,245 
Residential mortgage-backed securities665,150 553,427 
Total $1,415,493 $1,186,524 
Debt Securities, Available-for-Sale, Allowance for Credit Loss
The following table details the activity in the allowance for credit losses for the nine months ended September 30, 2023.
Nine Months Ended September 30, 2023
(in thousands)
Beginning balance$— 
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 September 30, 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)
September 30, 2023
U.S. Treasury securities$66,408 $— $(753)$65,655 $— $66,408 
U.S. government agency securities306,339 — (62,428)243,911 — 306,339 
Obligations of states and political subdivisions:
Obligations of states and state agencies86,968 5 (7,810)79,163 415 86,553 
Municipal bonds350,673 5 (39,287)311,391 57 350,616 
Total obligations of states and political subdivisions437,641 10 (47,097)390,554 472 437,169 
Residential mortgage-backed securities2,875,630 28 (523,042)2,352,616 — 2,875,630 
Trust preferred securities37,057 — (6,976)30,081 552 36,505 
Corporate and other debt securities75,634 — (7,371)68,263 297 75,337 
Total $3,798,709 $38 $(647,667)$3,151,080 $1,321 $3,797,388 
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 $3,827,338 
Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity
The age of unrealized losses and fair value of related debt securities held to maturity at September 30, 2023 and December 31, 2022 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
September 30, 2023
U.S. Treasury securities$— $— $65,655 $(753)$65,655 $(753)
U.S. government agency securities44,630 (104)198,137 (62,324)242,767 (62,428)
Obligations of states and political subdivisions:
Obligations of states and state agencies
28,861 (1,449)47,812 (6,361)76,673 (7,810)
Municipal bonds52,881 (1,260)200,811 (38,027)253,692 (39,287)
Total obligations of states and political subdivisions
81,742 (2,709)248,623 (44,388)330,365 (47,097)
Residential mortgage-backed securities
258,643 (6,081)2,065,357 (516,961)2,324,000 (523,042)
Trust preferred securities— — 29,081 (6,976)29,081 (6,976)
Corporate and other debt securities12,333 (917)55,930 (6,454)68,263 (7,371)
Total$397,348 $(9,811)$2,662,783 $(637,856)$3,060,131 $(647,667)
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 September 30, 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.
 September 30, 2023
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$72,211 $71,920 
Due after one year through five years114,349 109,797 
Due after five years through ten years116,099 105,165 
Due after ten years620,420 511,582 
Residential mortgage-backed securities2,875,630 2,352,616 
Total$3,798,709 $3,151,080 
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 September 30, 2023 and December 31, 2022.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
September 30, 2023
U.S. Treasury securities$66,408 $— $— $— $66,408 
U.S. government agency securities306,339 — — — 306,339 
Obligations of states and political subdivisions:
Obligations of states and state agencies64,595 — 5,351 17,022 86,968 
Municipal bonds301,098 — — 49,575 350,673 
Total obligations of states and political subdivisions
365,693 — 5,351 66,597 437,641 
Residential mortgage-backed securities2,875,630 — — — 2,875,630 
Trust preferred securities— — — 37,057 37,057 
Corporate and other debt securities— 6,000 — 69,634 75,634 
Total $3,614,070 $6,000 $5,351 $173,288 $3,798,709 
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 and nine months ended September 30, 2023 and 2022: 
Three months ended September 30,Nine months ended September 30,
2023202220232022
(in thousands)
Beginning balance$1,351 $1,508 $1,646 $1,165 
(Credit) provision for credit losses(30)188 (325)531 
Ending balance$1,321 $1,696 $1,321 $1,696