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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Debt Securities
The amortized cost, gross unrealized gains and losses and fair value of available for sale debt securities at December 31, 2023 and 2022 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in thousands)
December 31, 2023
U.S. Treasury securities $313,772 $— $(25,615)$288,157 
U.S. government agency securities25,967 19 (2,284)23,702 
Obligations of states and political subdivisions:
Obligations of states and state agencies48,283 — (588)47,695 
Municipal bonds170,260 — (26,265)143,995 
Total obligations of states and political subdivisions218,543 — (26,853)191,690 
Residential mortgage-backed securities703,875 728 (78,031)626,572 
Corporate and other debt securities192,282 — (25,827)166,455 
Total$1,454,439 $747 $(158,610)$1,296,576 
December 31, 2022
U.S. Treasury securities$308,137 $— $(28,639)$279,498 
U.S. government agency securities$29,494 $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)$1,261,397 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of related available for sale debt securities at December 31, 2023 and 2022 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
December 31, 2023
U.S. Treasury securities$— $— $288,156 $(25,615)$288,156 $(25,615)
U.S. government agency securities
— — 22,364 (2,284)22,364 (2,284)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 8,276 (588)8,276 (588)
Municipal bonds1,019 (4)142,976 (26,261)143,995 (26,265)
Total obligations of states and political subdivisions
1,019 (4)151,252 (26,849)152,271 (26,853)
Residential mortgage-backed securities
9,010 (3)569,629 (78,028)578,639 (78,031)
Corporate and other debt securities
4,977 (23)161,478 (25,804)166,455 (25,827)
Total$15,006 $(30)$1,192,879 $(158,580)$1,207,885 $(158,610)
December 31, 2022
U.S. Treasury securities$279,498 $(28,639)$— $— $279,498 $(28,639)
U.S. government agency securities
22,831 (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 securities
311,836 (27,152)314,834 (62,962)626,670 (90,114)
Corporate and other debt securities
144,924 (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 Available for Sale Debt Securities
The contractual maturities of AFS debt securities at December 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. 
 December 31, 2023
Amortized CostFair Value
 (in thousands)
Due in one year$1,927 $1,915 
Due after one year through five years289,471 278,092 
Due after five years through ten years172,871 147,051 
Due after ten years286,295 242,946 
Residential mortgage-backed securities703,875 626,572 
Total$1,454,439 $1,296,576 
Debt Securities, Available-for-Sale, Allowance for Credit Loss
The following table details the activity in the allowance for credit losses for the year ended December 31, 2023.
2023
(in thousands)
Beginning balance$— 
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 December 31, 2023 and 2022 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueAllowance for Credit LossesNet Carrying Value
 (in thousands)
December 31, 2023
U.S. Treasury securities$26,232 $— $(254)$25,978 $— $26,232 
U.S. government agency securities305,996 — (44,441)261,555 — 305,996 
Obligations of states and political subdivisions:
Obligations of states and state agencies88,556 552 (4,155)84,953 395 88,161 
Municipal bonds316,914 40 (14,380)302,574 49 316,865 
Total obligations of states and political subdivisions405,470 592 (18,535)387,527 444 405,026 
Residential mortgage-backed securities2,885,303 6,059 (369,436)2,521,926 — 2,885,303 
Trust preferred securities37,062 — (6,412)30,650 506 36,556 
Corporate and other debt securities80,350 — (5,674)74,676 255 80,095 
Total$3,740,413 $6,651 $(444,752)$3,302,312 $1,205 $3,739,208 
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 $3,827,338 
Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity
The age of unrealized losses and fair value of related debt securities held to maturity at December 31, 2023 and 2022 were as follows:
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
December 31, 2023
U.S. Treasury securities$— $— $25,978 $(254)$25,978 $(254)
U.S. government agency securities43,664 (151)216,759 (44,290)260,423 (44,441)
Obligations of states and political subdivisions:
Obligations of states and state agencies10,700 (102)48,149 (4,053)58,849 (4,155)
Municipal bonds11,958 (121)207,520 (14,259)219,478 (14,380)
Total obligations of states and political subdivisions22,658 (223)255,669 (18,312)278,327 (18,535)
Residential mortgage-backed securities
57,085 (505)2,164,704 (368,931)2,221,789 (369,436)
Trust preferred securities938 (63)29,712 (6,349)30,650 (6,412)
Corporate and other debt securities12,575 (426)59,102 (5,248)71,677 (5,674)
Total$136,920 $(1,368)$2,751,924 $(443,384)$2,888,844 $(444,752)
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 securities57,245 (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 Investments Debt Securities Held to Maturity
The contractual maturities of investments in debt securities HTM at December 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. 
 December 31, 2023
 Amortized CostFair Value
 (in thousands)
Due in one year$26,756 $26,730 
Due after one year through five years111,161 108,553 
Due after five years through ten years156,190 149,634 
Due after ten years561,003 495,469 
Residential mortgage-backed securities2,885,303 2,521,926 
Total$3,740,413 $3,302,312 
Amortized Cost of Held to Maturity Debt Securities by External Credit Rating The following table summarizes the amortized cost of held to maturity debt securities by external credit rating at December 31, 2023 and 2022.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
December 31, 2023
U.S. Treasury securities$26,232 $— $— $— $26,232 
U.S. government agency securities305,996 — — — 305,996 
Obligations of states and political subdivisions:
Obligations of states and state agencies66,502 — 5,330 16,724 88,556 
Municipal bonds283,441 — — 33,473 316,914 
Total obligations of states and political subdivisions349,943 — 5,330 50,197 405,470 
Residential mortgage-backed securities2,885,303 — — — 2,885,303 
Trust preferred securities— — 37,062 37,062 
Corporate and other debt securities— 6,000 — 74,350 80,350 
Total$3,567,474 $6,000 $5,330 $161,609 $3,740,413 
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 subdivisions408,431 — 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
HTM debt securities are carried net of an allowance for credit losses. The following table details the activity in the allowance for credit losses for the years ended December 31, 2023, 2022 and 2021: 
202320222021
(in thousands)
Beginning balance$1,646 $1,165 $1,428 
(Credit) provision for credit losses(441)481 (263)
Ending balance$1,205 $1,646 $1,165 
Gross Gains and Losses Realized on Sales, Maturities, and Other Securities Transactions
Gross gains and losses realized on sales, maturities and other securities transactions related to AFS securities and net gains on trading debt securities included in earnings for the years ended December 31, 2023, 2022 and 2021 were as follows:
202320222021
 (in thousands)
Sales transactions:
Gross gains
$869 $— $1,370 
Gross losses— — (550)
Total$869 $— $820 
Maturities and other securities transactions:
Gross gains
$21 $171 $10 
Gross losses(488)(76)(285)
Total(467)95 (275)
Net gains (losses) on trading debt securities702 (1,325)1,213 
 Gains (losses) on securities transactions, net$1,104 $(1,230)$1,758