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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The amortized cost and fair values of AFS and HTM securities at September 30, 2025 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $1 $(45)$3,019 
Residential mortgage-related securities:
FNMA/FHLMC128,541 907 (5,888)123,560 
GNMA4,827,672 34,848 (295)4,862,225 
Commercial mortgage-related securities:
FNMA/FHLMC18,054 — (1,055)16,999 
GNMA114,247 — (4,317)109,930 
Asset backed securities:
FFELP98,889 39 (731)98,198 
SBA363 — (15)348 
Other debt securities3,000 — — 3,000 
Total AFS investment securities$5,193,828 $35,796 $(12,346)$5,217,278 
HTM investment securities
U.S. Treasury securities$995 $19 $— $1,014 
Obligations of state and political subdivisions (municipal securities)1,637,318 1,640 (153,562)1,485,396 
Residential mortgage-related securities:
FNMA/FHLMC836,619 19,924 (150,818)705,725 
GNMA40,301 60 (2,490)37,871 
Private-label307,569 7,019 (53,549)261,038 
Commercial mortgage-related securities:
FNMA/FHLMC766,482 8,503 (125,634)649,352 
GNMA46,855 166 (5,023)41,998 
Total HTM investment securities$3,636,139 $37,331 $(491,077)$3,182,394 
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $— $(58)$3,005 
Residential mortgage-related securities:
FNMA/FHLMC120,272 190 (9,534)110,928 
GNMA4,236,199 5,379 (13,851)4,227,727 
Commercial mortgage-related securities:
FNMA/FHLMC18,332 — (1,332)17,000 
GNMA116,275 — (4,800)111,475 
Asset backed securities:
FFELP108,319 123 (604)107,839 
SBA495 — (24)471 
Other debt securities3,000 — (11)2,989 
Total AFS investment securities$4,605,954 $5,693 $(30,213)$4,581,434 
HTM investment securities
U.S. Treasury securities$1,000 $— $(1)$999 
Obligations of state and political subdivisions (municipal securities)1,659,722 1,122 (174,202)1,486,642 
Residential mortgage-related securities:
FNMA/FHLMC885,476 22,934 (186,464)721,946 
GNMA43,693 9 (3,774)39,927 
Private-label324,182 8,135 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC772,456 10,217 (159,078)623,595 
GNMA52,219 236 (6,424)46,032 
 Total HTM investment securities$3,738,747 $42,653 $(595,906)$3,185,494 
Debt Securities, Held-to-Maturity [Table Text Block] The amortized cost and fair values of AFS and HTM securities at September 30, 2025 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $1 $(45)$3,019 
Residential mortgage-related securities:
FNMA/FHLMC128,541 907 (5,888)123,560 
GNMA4,827,672 34,848 (295)4,862,225 
Commercial mortgage-related securities:
FNMA/FHLMC18,054 — (1,055)16,999 
GNMA114,247 — (4,317)109,930 
Asset backed securities:
FFELP98,889 39 (731)98,198 
SBA363 — (15)348 
Other debt securities3,000 — — 3,000 
Total AFS investment securities$5,193,828 $35,796 $(12,346)$5,217,278 
HTM investment securities
U.S. Treasury securities$995 $19 $— $1,014 
Obligations of state and political subdivisions (municipal securities)1,637,318 1,640 (153,562)1,485,396 
Residential mortgage-related securities:
FNMA/FHLMC836,619 19,924 (150,818)705,725 
GNMA40,301 60 (2,490)37,871 
Private-label307,569 7,019 (53,549)261,038 
Commercial mortgage-related securities:
FNMA/FHLMC766,482 8,503 (125,634)649,352 
GNMA46,855 166 (5,023)41,998 
Total HTM investment securities$3,636,139 $37,331 $(491,077)$3,182,394 
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $— $(58)$3,005 
Residential mortgage-related securities:
FNMA/FHLMC120,272 190 (9,534)110,928 
GNMA4,236,199 5,379 (13,851)4,227,727 
Commercial mortgage-related securities:
FNMA/FHLMC18,332 — (1,332)17,000 
GNMA116,275 — (4,800)111,475 
Asset backed securities:
FFELP108,319 123 (604)107,839 
SBA495 — (24)471 
Other debt securities3,000 — (11)2,989 
Total AFS investment securities$4,605,954 $5,693 $(30,213)$4,581,434 
HTM investment securities
U.S. Treasury securities$1,000 $— $(1)$999 
Obligations of state and political subdivisions (municipal securities)1,659,722 1,122 (174,202)1,486,642 
Residential mortgage-related securities:
FNMA/FHLMC885,476 22,934 (186,464)721,946 
GNMA43,693 9 (3,774)39,927 
Private-label324,182 8,135 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC772,456 10,217 (159,078)623,595 
GNMA52,219 236 (6,424)46,032 
 Total HTM investment securities$3,738,747 $42,653 $(595,906)$3,185,494 
Investments Classified by Contractual Maturity Date [Table Text Block] The expected maturities of AFS and HTM securities at September 30, 2025, are shown below:
 AFSHTM
(in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$1,000 $1,000 $4,384 $4,385 
Due after one year through five years3,040 3,034 93,085 93,182 
Due after five years through ten years1,390 1,391 220,964 217,504 
Due after ten years633 594 1,319,880 1,171,339 
Total debt securities6,063 6,019 1,638,313 1,486,410 
Residential mortgage-related securities:
FNMA/FHLMC128,541 123,560 836,619 705,725 
GNMA4,827,672 4,862,225 40,301 37,871 
Private-label— — 307,569 261,038 
Commercial mortgage-related securities:
FNMA/FHLMC18,054 16,999 766,482 649,352 
GNMA114,247 109,930 46,855 41,998 
Asset backed securities:
FFELP 98,889 98,198 — — 
SBA363 348 — — 
Total investment securities$5,193,828 $5,217,278 $3,636,139 $3,182,394 
Ratio of fair value to amortized cost100.5 %87.5 %
Schedule of Realized Gain (Loss) [Table Text Block]
The following table summarizes gross realized gains and losses on AFS securities, the gain or loss on sale and fair value adjustment of equity securities, and proceeds from the sale of AFS investment securities:
Three Months Ended Sep 30,Nine Months Ended Sep 30,
(in thousands)2025202420252024
Gross realized (losses) on AFS securities$— $— $— $(197)
Gain on sale of equity securities— — — 4,054 
Fair value adjustment of equity securities1 100 13 190 
Investment securities gains, net$1 $100 $13 $4,047 
Proceeds from sales of AFS investment securities$— $— $— $9,472 
Schedule of Unrealized Loss on Investments [Table Text Block]
The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2025:
 Less than 12 months12 months or moreTotal
(in thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)— $— $— 2 $(45)$838 $(45)838 
Residential mortgage-related securities:
FNMA/FHLMC5 (44)5,235 15 (5,845)61,665 (5,888)66,900 
GNMA12 (263)52,515 3 (33)2,675 (295)55,189 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,055)16,999 (1,055)16,999 
GNMA— — — 15 (4,317)109,930 (4,317)109,930 
Asset backed securities:
FFELP1 (23)6,372 12 (708)57,378 (731)63,750 
SBA— — — 2 (15)261 (15)261 
Other debt securities— — — — — — — — 
Total18 $(329)$64,122 50 $(12,017)$249,745 $(12,346)$313,868 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)151 $(3,421)$241,505 614 $(150,141)$934,607 $(153,562)$1,176,112 
Residential mortgage-related securities:
FNMA/FHLMC2 (1)181 109 (150,817)697,875 (150,818)698,056 
GNMA— — — 80 (2,490)31,066 (2,490)31,066 
Private-label— — — 18 (53,549)261,038 (53,549)261,038 
 Commercial mortgage-related securities:
FNMA/FHLMC1 (205)18,314 44 (125,429)631,038 (125,634)649,352 
GNMA— — — 13 (5,023)41,998 (5,023)41,998 
Total154 $(3,627)$259,999 878 $(487,450)$2,597,622 $(491,077)$2,857,621 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2024:
 Less than 12 months12 months or moreTotal
(in thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)1 $(3)$542 2 $(55)$828 $(58)$1,370 
Residential mortgage-related securities:
FNMA/FHLMC23 (607)31,983 14 (8,927)61,596 (9,534)93,579 
GNMA116 (13,706)1,660,642 4 (145)3,945 (13,851)1,664,587 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,332)17,000 (1,332)17,000 
GNMA— — — 16 (4,800)111,475 (4,800)111,475 
Asset backed securities:
FFELP— — — 12 (604)62,830 (604)62,830 
SBA— — — 4 (24)464 (24)464 
Other debt securities1 (7)993 1 (3)997 (11)1,989 
Total141 $(14,323)$1,694,159 54 $(15,890)$259,134 $(30,213)$1,953,294 
HTM investment securities
U.S. Treasury securities— $— $— 1 $(1)$999 $(1)$999 
Obligations of state and political subdivisions (municipal securities)370 (11,860)483,073 641 (162,343)866,949 (174,202)1,350,022 
Residential mortgage-related securities:
FNMA/FHLMC12 (280)11,617 106 (186,184)710,114 (186,464)721,732 
GNMA7 (183)8,856 79 (3,591)31,071 (3,774)39,927 
Private-label— — — 18 (65,963)266,353 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC2 (1,343)25,518 43 (157,735)598,077 (159,078)623,595 
GNMA— — — 13 (6,424)46,032 (6,424)46,032 
Total391 $(13,665)$529,064 901 $(582,241)$2,519,595 $(595,906)$3,048,660