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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
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 AFS debt securities at December 31, 2024 and 2023 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in thousands)
December 31, 2024
U.S. Treasury securities $319,551 $— $(28,002)$291,549 
U.S. government agency securities24,636 20 (2,113)22,543 
Obligations of states and political subdivisions:
Obligations of states and state agencies46,211 — (682)45,529 
Municipal bonds179,284 — (32,304)146,980 
Total obligations of states and political subdivisions225,495 — (32,986)192,509 
Residential mortgage-backed securities2,784,895 3,796 (107,615)2,681,076 
Corporate and other debt securities197,696 247 (15,896)182,047 
Total$3,552,273 $4,063 $(186,612)$3,369,724 
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)$1,296,576 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of related AFS debt securities at December 31, 2024 and 2023 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
December 31, 2024
U.S. Treasury securities$— $— $291,549 $(28,002)$291,549 $(28,002)
U.S. government agency securities
— — 21,281 (2,113)21,281 (2,113)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 6,208 (682)6,208 (682)
Municipal bonds— — 139,216 (32,304)139,216 (32,304)
Total obligations of states and political subdivisions
— — 145,424 (32,986)145,424 (32,986)
Residential mortgage-backed securities
1,483,442 (22,242)501,858 (85,373)1,985,300 (107,615)
Corporate and other debt securities
— — 166,800 (15,896)166,800 (15,896)
Total$1,483,442 $(22,242)$1,126,912 $(164,370)$2,610,354 $(186,612)
December 31, 2023
U.S. Treasury securities$— $— $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)
Contractual Maturities of Available for Sale Debt Securities
The contractual maturities of AFS debt securities at December 31, 2024 are set forth in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Residential mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties. 
 December 31, 2024
Amortized CostFair Value
 (in thousands)
Due in one year$177,290 $174,474 
Due after one year through five years123,053 117,533 
Due after five years through ten years174,490 157,526 
Due after ten years292,545 239,115 
Residential mortgage-backed securities2,784,895 2,681,076 
Total$3,552,273 $3,369,724 
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 HTM debt securities at December 31, 2024 and 2023 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueAllowance for Credit LossesNet Carrying Value
 (in thousands)
December 31, 2024
U.S. Treasury securities$25,480 $— $(19)$25,461 $— $25,480 
U.S. government agency securities301,315 — (49,013)252,302 — 301,315 
Obligations of states and political subdivisions:
Obligations of states and state agencies
68,025 — (5,335)62,690 2 68,023 
Municipal bonds304,464 9 (20,802)283,671 48 304,416 
Total obligations of states and political subdivisions
372,489 9 (26,137)346,361 50 372,439 
Residential mortgage-backed securities2,710,642 2,088 (420,582)2,292,148 — 2,710,642 
Trust preferred securities36,081 — (6,936)29,145 414 35,667 
Corporate and other debt securities86,213 10 (3,356)82,867 183 86,030 
Total$3,532,220 $2,107 $(506,043)$3,028,284 $647 $3,531,573 
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 agencies
88,556 552 (4,155)84,953 395 88,161 
Municipal bonds316,914 40 (14,380)302,574 49 316,865 
Total obligations of states and political subdivisions
405,470 592 (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 
Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity
The age of unrealized losses and fair value of related HTM debt securities at December 31, 2024 and 2023 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, 2024
U.S. Treasury securities$25,461 $(19)$— $— $25,461 $(19)
U.S. government agency securities22,621 (75)229,143 (48,938)251,764 (49,013)
Obligations of states and political subdivisions:
Obligations of states and state agencies20,632 (517)42,058 (4,818)62,690 (5,335)
Municipal bonds36,766 (440)210,723 (20,362)247,489 (20,802)
Total obligations of states and political subdivisions57,398 (957)252,781 (25,180)310,179 (26,137)
Residential mortgage-backed securities
216,651 (2,687)1,917,644 (417,895)2,134,295 (420,582)
Trust preferred securities— — 29,145 (6,936)29,145 (6,936)
Corporate and other debt securities5,977 (23)63,879 (3,333)69,856 (3,356)
Total$328,108 $(3,761)$2,492,592 $(502,282)$2,820,700 $(506,043)
December 31, 2023
U.S. Treasury securities$— $— $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 subdivisions
22,658 (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)
Contractual Maturities of Investments Debt Securities Held to Maturity
The contractual maturities of investments in HTM debt securities at December 31, 2024 are set forth in the table below. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Residential mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties. 
 December 31, 2024
 Amortized CostFair Value
 (in thousands)
Due in one year$59,345 $59,271 
Due after one year through five years65,022 63,861 
Due after five years through ten years173,753 163,055 
Due after ten years523,458 449,949 
Residential mortgage-backed securities2,710,642 2,292,148 
Total$3,532,220 $3,028,284 
Amortized Cost of Held to Maturity Debt Securities by External Credit Rating The following table summarizes the amortized cost of HTM debt securities by external credit rating at December 31, 2024 and 2023.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
December 31, 2024
U.S. Treasury securities$25,480 $— $— $— $25,480 
U.S. government agency securities301,315 — — — 301,315 
Obligations of states and political subdivisions:
Obligations of states and state agencies52,770 — — 15,255 68,025 
Municipal bonds277,921 — — 26,543 304,464 
Total obligations of states and political subdivisions330,691 — — 41,798 372,489 
Residential mortgage-backed securities2,710,642 — — — 2,710,642 
Trust preferred securities— — 36,081 36,081 
Corporate and other debt securities— 6,000 — 80,213 86,213 
Total$3,368,128 $6,000 $— $158,092 $3,532,220 
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 
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, 2024, 2023 and 2022: 
202420232022
(in thousands)
Beginning balance$1,205 $1,646 $1,165 
(Credit) provision for credit losses(558)(441)481 
Ending balance$647 $1,205 $1,646 
Gross Gains and Losses Realized on Sales, Maturities, and Other Securities Transactions
Gross gains and losses realized on sales, maturities and other securities transactions related to AFS securities and net gains and losses on trading debt securities included in earnings for the years ended December 31, 2024, 2023 and 2022 were as follows:
202420232022
 (in thousands)
Sales transactions:
Gross gains$— $869 $— 
Total— 869 — 
Maturities and other securities transactions:
Gross gains3 21 171 
Gross losses(18)(488)(76)
Total(15)(467)95 
Net gains (losses) on trading debt securities115 702 (1,325)
 Gains (losses) on securities transactions, net$100 $1,104 $(1,230)