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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
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 available for sale debt securities at March 31, 2022 and December 31, 2021 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
March 31, 2022
U.S. government agency securities$18,448 $32 $(148)$18,332 
Obligations of states and political subdivisions:
Obligations of states and state agencies25,274 22 (310)24,986 
Municipal bonds47,270 66 (4,371)42,965 
Total obligations of states and political subdivisions72,544 88 (4,681)67,951 
Residential mortgage-backed securities829,222 971 (34,639)795,554 
Corporate and other debt securities135,550 1,033 (3,386)133,197 
Total $1,055,764 $2,124 $(42,854)$1,015,034 
December 31, 2021
U.S. government agency securities$20,323 $608 $(6)$20,925 
Obligations of states and political subdivisions:
Obligations of states and state agencies26,088 132 (93)26,127 
Municipal bonds53,530 349 (116)53,763 
Total obligations of states and political subdivisions79,618 481 (209)79,890 
Residential mortgage-backed securities895,279 14,986 (5,763)904,502 
Corporate and other debt securities120,871 3,177 (556)123,492 
Total$1,116,091 $19,252 $(6,534)$1,128,809 
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 available for sale debt securities at March 31, 2022 and December 31, 2021 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
March 31, 2022
U.S. government agency securities$13,880 $(140)$1,292 $(8)$15,172 $(148)
Obligations of states and political subdivisions:
Obligations of states and state agencies
10,153 (310)— — 10,153 (310)
Municipal bonds31,523 (4,371)— — 31,523 (4,371)
Total obligations of states and political subdivisions
41,676 (4,681)— — 41,676 (4,681)
Residential mortgage-backed securities688,282 (31,427)39,143 (3,212)727,425 (34,639)
Corporate and other debt securities74,665 (3,386)— — 74,665 (3,386)
Total$818,503 $(39,634)$40,435 $(3,220)$858,938 $(42,854)
December 31, 2021
U.S. government agency securities$— $— $1,326 $(6)$1,326 $(6)
Obligations of states and political subdivisions:
Obligations of states and state agencies
10,549 (93)— — 10,549 (93)
Municipal bonds19,100 (116)— — 19,100 (116)
Total obligations of states and political subdivisions
29,649 (209)— — 29,649 (209)
Residential mortgage-backed securities371,256 (4,770)25,960 (993)397,216 (5,763)
Corporate and other debt securities59,039 (556)— — 59,039 (556)
Total$459,944 $(5,535)$27,286 $(999)$487,230 $(6,534)
Contractual Maturities of Debt Securities Available for Sale
The contractual maturities of available for sale debt securities at March 31, 2022 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.
 March 31, 2022
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$11,305 $11,303 
Due after one year through five years23,241 23,375 
Due after five years through ten years103,691 102,991 
Due after ten years88,305 81,811 
Residential mortgage-backed securities829,222 795,554 
Total $1,055,764 $1,015,034 
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 March 31, 2022 and December 31, 2021 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
March 31, 2022
U.S. Treasury securities$67,401 $1,531 $— $68,932 
U.S. government agency securities5,572 — (119)5,453 
Obligations of states and political subdivisions:
Obligations of states and state agencies132,017 648 (1,054)131,611 
Municipal bonds187,143 871 (1,604)186,410 
Total obligations of states and political subdivisions319,160 1,519 (2,658)318,021 
Residential mortgage-backed securities2,594,295 1,993 (155,790)2,440,498 
Trust preferred securities37,027 4 (5,298)31,733 
Corporate and other debt securities49,750 181 (717)49,214 
Total $3,073,205 $5,228 $(164,582)$2,913,851 
December 31, 2021
U.S. Treasury securities$67,558 $4,103 $— $71,661 
U.S. government agency securities6,265 113 — 6,378 
Obligations of states and political subdivisions:
Obligations of states and state agencies141,015 3,065 (312)143,768 
Municipal bonds196,947 3,536 (87)200,396 
Total obligations of states and political subdivisions337,962 6,601 (399)344,164 
Residential mortgage-backed securities2,166,142 14,599 (28,440)2,152,301 
Trust preferred securities37,020 5 (5,109)31,916 
Corporate and other debt securities53,750 559 (124)54,185 
Total $2,668,697 $25,980 $(34,072)$2,660,605 
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 March 31, 2022 and December 31, 2021 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
March 31, 2022
U.S. government agency securities$4,092 $(119)$— $— $4,092 $(119)
Obligations of states and political subdivisions:
Obligations of states and state agencies
38,979 (815)5,317 (239)44,296 (1,054)
Municipal bonds25,255 (1,514)1,305 (90)26,560 (1,604)
Total obligations of states and political subdivisions
64,234 (2,329)6,622 (329)70,856 (2,658)
Residential mortgage-backed securities
1,786,943 (105,507)533,425 (50,283)2,320,368 (155,790)
Trust preferred securities— — 30,729 (5,298)30,729 (5,298)
Corporate and other debt securities37,783 (717)— — 37,783 (717)
Total$1,893,052 $(108,672)$570,776 $(55,910)$2,463,828 $(164,582)
December 31, 2021
Obligations of states and political subdivisions:
Obligations of states and state agencies$17,000 $(254)$5,517 $(58)$22,517 $(312)
Municipal bonds9,403 (87)— — 9,403 (87)
Total obligations of states and political subdivisions
26,403 (341)5,517 (58)31,920 (399)
Residential mortgage-backed securities
1,381,405 (22,365)206,520 (6,075)1,587,925 (28,440)
Trust preferred securities— — 30,912 (5,109)30,912 (5,109)
Corporate and other debt securities
32,627 (124)— — 32,627 (124)
Total$1,440,435 $(22,830)$242,949 $(11,242)$1,683,384 $(34,072)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at March 31, 2022 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.  
 March 31, 2022
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$39,603 $39,663 
Due after one year through five years215,490 217,668 
Due after five years through ten years46,097 45,919 
Due after ten years177,720 170,103 
Residential mortgage-backed securities2,594,295 2,440,498 
Total$3,073,205 $2,913,851 
Amortized Cost of Debt Securities Held to Maturity by External Credit Rating The following table summarizes the amortized cost of held to maturity debt securities by external credit rating at March 31, 2022 and December 31, 2021.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
March 31, 2022
U.S. Treasury securities$67,401 $— $— $— $67,401 
U.S. government agency securities5,572 — — — 5,572 
Obligations of states and political subdivisions:
Obligations of states and state agencies110,710 — 5,556 15,751 132,017 
Municipal bonds135,463 — — 51,680 187,143 
Total obligations of states and political subdivisions
246,173 — 5,556 67,431 319,160 
Residential mortgage-backed securities2,594,295 — — — 2,594,295 
Trust preferred securities— — — 37,027 37,027 
Corporate and other debt securities2,000 6,000 — 41,750 49,750 
Total $2,915,441 $6,000 $5,556 $146,208 $3,073,205 
December 31, 2021
U.S. Treasury securities$67,558 $— $— $— $67,558 
U.S. government agency securities6,265 — — — 6,265 
Obligations of states and political subdivisions:
Obligations of states and state agencies118,368 — 5,576 17,071 141,015 
Municipal bonds148,854 — — 48,093 196,947 
Total obligations of states and political subdivisions
267,222 — 5,576 65,164 337,962 
Residential mortgage-backed securities2,166,142 — — — 2,166,142 
Trust preferred securities— — — 37,020 37,020 
Corporate and other debt securities2,000 6,000 — 45,750 53,750 
Total$2,509,187 $6,000 $5,576 $147,934 $2,668,697