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Investment Securities (Tables)
 6 Months Ended
Jun. 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 June 30, 2025 and December 31, 2024 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
June 30, 2025
U.S. Treasury securities$322,493 $— $(24,423)$298,070 
U.S. government agency securities23,849 25 (1,471)22,403 
Obligations of states and political subdivisions:
Obligations of states and state agencies45,650 — (836)44,814 
Municipal bonds180,577 — (41,114)139,463 
Total obligations of states and political subdivisions226,227 — (41,950)184,277 
Residential mortgage-backed securities3,243,118 25,456 (79,761)3,188,813 
Corporate and other debt securities214,410 489 (12,257)202,642 
Total $4,030,097 $25,970 $(159,862)$3,896,205 
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)$3,369,724 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of the related AFS debt securities at June 30, 2025 and December 31, 2024 were as follows: 
 Less than 12 MonthsMore than 12 MonthsTotal
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
June 30, 2025
U.S. Treasury securities$— $— $298,070 $(24,423)$298,070 $(24,423)
U.S. government agency securities— — 21,179 (1,471)21,179 (1,471)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 5,744 (836)5,744 (836)
Municipal bonds— — 131,768 (41,114)131,768 (41,114)
Total obligations of states and political subdivisions
— — 137,512 (41,950)137,512 (41,950)
Residential mortgage-backed securities674,361 (7,204)505,120 (72,557)1,179,481 (79,761)
Corporate and other debt securities4,628 (372)166,024 (11,885)170,652 (12,257)
Total$678,989 $(7,576)$1,127,905 $(152,286)$1,806,894 $(159,862)
December 31, 2024
U.S. Treasury securities$— $— $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 June 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.
 June 30, 2025
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$179,139 $177,670 
Due after one year through five years140,847 137,361 
Due after five years through ten years175,717 162,664 
Due after ten years291,276 229,697 
Residential mortgage-backed securities3,243,118 3,188,813 
Total $4,030,097 $3,896,205 
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 June 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)
June 30, 2025
U.S. Treasury securities$25,095 $— $(16)$25,079 $— $25,095 
U.S. government agency securities297,057 6 (43,324)253,739 — 297,057 
Obligations of states and political subdivisions:
Obligations of states and state agencies64,729 167 (4,457)60,439 1 64,728 
Municipal bonds293,648 13 (25,606)268,055 74 293,574 
Total obligations of states and political subdivisions358,377 180 (30,063)328,494 75 358,302 
Residential mortgage-backed securities2,731,797 6,564 (367,800)2,370,561 — 2,731,797 
Trust preferred securities36,092 — (6,364)29,728 408 35,684 
Corporate and other debt securities83,143 1 (2,344)80,800 154 82,989 
Total $3,531,561 $6,751 $(449,911)$3,088,401 $637 $3,530,924 
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 June 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)
June 30, 2025
U.S. Treasury securities$25,079 $(16)$— $— $25,079 $(16)
U.S. government agency securities— — 234,270 (43,324)234,270 (43,324)
Obligations of states and political subdivisions:
Obligations of states and state agencies5,762 (191)41,766 (4,266)47,528 (4,457)
Municipal bonds27,598 (444)186,299 (25,162)213,897 (25,606)
Total obligations of states and political subdivisions
33,360 (635)228,065 (29,428)261,425 (30,063)
Residential mortgage-backed securities
59,062 (859)1,876,157 (366,941)1,935,219 (367,800)
Trust preferred securities— — 29,728 (6,364)29,728 (6,364)
Corporate and other debt securities17,960 (40)57,838 (2,304)75,798 (2,344)
Total$135,461 $(1,550)$2,426,058 $(448,361)$2,561,519 $(449,911)
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 June 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.
 June 30, 2025
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$63,269 $63,061 
Due after one year through five years49,356 48,874 
Due after five years through ten years164,449 156,160 
Due after ten years522,690 449,745 
Residential mortgage-backed securities2,731,797 2,370,561 
Total$3,531,561 $3,088,401 
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 June 30, 2025 and December 31, 2024.
AAA/AA/A RatedBBB ratedNon-ratedTotal
 (in thousands)
June 30, 2025
U.S. Treasury securities$25,095 $— $— $25,095 
U.S. government agency securities297,057 — — 297,057 
Obligations of states and political subdivisions:
Obligations of states and state agencies49,610 — 15,119 64,729 
Municipal bonds255,035 — 38,613 293,648 
Total obligations of states and political subdivisions
304,645 — 53,732 358,377 
Residential mortgage-backed securities2,731,797 — — 2,731,797 
Trust preferred securities— — 36,092 36,092 
Corporate and other debt securities— 6,000 77,143 83,143 
Total $3,358,594 $6,000 $166,967 $3,531,561 
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 subdivisions
330,691 — 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 six months ended June 30, 2025 and 2024: 
Three Months Ended
June 30,		Six Months Ended
June 30,
2025202420252024
(in thousands)
Beginning balance$633 $1,131 $647 $1,205 
Provision (credit) for credit losses4 (41)(10)(115)
Ending balance$637 $1,090 $637 $1,090