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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
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 AFS debt securities at September 30, 2025 and December 31, 2024 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
September 30, 2025
U.S. Treasury securities$349,355 $28 $(22,639)$326,744 
U.S. government agency securities41,040 21 (1,292)39,769 
Obligations of states and political subdivisions:
Obligations of states and state agencies45,182 — (646)44,536 
Municipal bonds181,217 1 (34,745)146,473 
Total obligations of states and political subdivisions226,399 1 (35,391)191,009 
Residential mortgage-backed securities3,363,907 30,342 (68,150)3,326,099 
Corporate and other debt securities241,468 1,593 (9,561)233,500 
Total $4,222,169 $31,985 $(137,033)$4,117,121 
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)$3,369,724 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of the related AFS debt securities at September 30, 2025 and December 31, 2024 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
September 30, 2025
U.S. Treasury securities$— $— $301,335 $(22,639)$301,335 $(22,639)
U.S. government agency securities17,958 (43)20,614 (1,249)38,572 (1,292)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 5,741 (646)5,741 (646)
Municipal bonds— — 137,577 (34,745)137,577 (34,745)
Total obligations of states and political subdivisions
— — 143,318 (35,391)143,318 (35,391)
Residential mortgage-backed securities189,309 (367)706,670 (67,783)895,979 (68,150)
Corporate and other debt securities18,862 (88)148,545 (9,473)167,407 (9,561)
Total$226,129 $(498)$1,320,482 $(136,535)$1,546,611 $(137,033)
December 31, 2024
U.S. Treasury securities$— $— $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 securities1,483,442 (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)
Contractual Maturities of Debt Securities Available for Sale
The contractual maturities of AFS debt securities at September 30, 2025 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.
 September 30, 2025
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$180,068 $179,422 
Due after one year through five years164,880 162,294 
Due after five years through ten years220,989 211,315 
Due after ten years292,325 237,991 
Residential mortgage-backed securities3,363,907 3,326,099 
Total $4,222,169 $4,117,121 
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 September 30, 2025 and December 31, 2024 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueAllowance for Credit LossesNet Carrying Value
 (in thousands)
September 30, 2025
U.S. government agency securities$292,897 $— $(39,617)$253,280 $— $292,897 
Obligations of states and political subdivisions:
Obligations of states and state agencies62,184 384 (3,512)59,056 1 62,183 
Municipal bonds287,789 22 (20,734)267,077 69 287,720 
Total obligations of states and political subdivisions349,973 406 (24,246)326,133 70 349,903 
Residential mortgage-backed securities2,777,381 9,440 (329,593)2,457,228 — 2,777,381 
Trust preferred securities36,097 — (5,511)30,586 411 35,686 
Corporate and other debt securities85,108 — (1,812)83,296 156 84,952 
Total $3,541,456 $9,846 $(400,779)$3,150,523 $637 $3,540,819 
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 subdivisions372,489 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 
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 September 30, 2025 and December 31, 2024 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
September 30, 2025
U.S. government agency securities$18,376 $(33)$234,820 $(39,584)$253,196 $(39,617)
Obligations of states and political subdivisions:
Obligations of states and state agencies5,932 (68)34,333 (3,444)40,265 (3,512)
Municipal bonds9,909 (1,446)187,990 (19,288)197,899 (20,734)
Total obligations of states and political subdivisions
15,841 (1,514)222,323 (22,732)238,164 (24,246)
Residential mortgage-backed securities
59,991 (172)1,898,012 (329,421)1,958,003 (329,593)
Trust preferred securities— — 30,586 (5,511)30,586 (5,511)
Corporate and other debt securities17,000 — 61,296 (1,812)78,296 (1,812)
Total$111,208 $(1,719)$2,447,037 $(399,060)$2,558,245 $(400,779)
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 subdivisions
57,398 (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 securities
5,977 (23)63,879 (3,333)69,856 (3,356)
Total$328,108 $(3,761)$2,492,592 $(502,282)$2,820,700 $(506,043)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in HTM debt securities at September 30, 2025 is 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.
 September 30, 2025
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$58,761 $58,459 
Due after one year through five years30,364 30,347 
Due after five years through ten years163,250 156,951 
Due after ten years511,700 447,538 
Residential mortgage-backed securities2,777,381 2,457,228 
Total$3,541,456 $3,150,523 
Amortized Cost of Debt Securities Held to Maturity by External Credit Rating The following table summarizes the amortized cost of HTM debt securities by external credit rating at September 30, 2025 and December 31, 2024.
AAA/AA/A RatedBBB ratedNon-ratedTotal
 (in thousands)
September 30, 2025
U.S. government agency securities$292,897 $— $— $292,897 
Obligations of states and political subdivisions:
Obligations of states and state agencies48,366 — 13,818 62,184 
Municipal bonds241,282 — 46,507 287,789 
Total obligations of states and political subdivisions289,648 — 60,325 349,973 
Residential mortgage-backed securities2,777,381 — — 2,777,381 
Trust preferred securities— — 36,097 36,097 
Corporate and other debt securities— 3,000 82,108 85,108 
Total $3,359,926 $3,000 $178,530 $3,541,456 
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 
Debt Securities, Held-to-Maturity, Allowance for Credit Loss
The following table details the activity in the allowance for credit losses for HTM securities for the three and nine months ended September 30, 2025 and 2024: 
Three Months Ended
September 30,		Nine Months Ended
September 30,
2025202420252024
(in thousands)
Beginning balance$637 $1,090 $647 $1,205 
Provision (credit) for credit losses— (14)(10)(129)
Ending balance$637 $1,076 $637 $1,076