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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
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 available for sale debt securities at December 31, 2021 and 2020 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in thousands)
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 
December 31, 2020
U.S. Treasury securities$50,031 $1,362 $— $51,393 
U.S. government agency securities25,067 1,103 (13)26,157 
Obligations of states and political subdivisions:
Obligations of states and state agencies40,861 970 (32)41,799 
Municipal bonds37,489 731 (69)38,151 
Total obligations of states and political subdivisions78,350 1,701 (101)79,950 
Residential mortgage-backed securities1,050,369 40,426 (773)1,090,022 
Corporate and other debt securities89,689 2,294 (32)91,951 
Total$1,293,506 $46,886 $(919)$1,339,473 
Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities
The age of unrealized losses and fair value of related available for sale debt securities at December 31, 2021 and 2020 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, 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 securities
371,256 (4,770)25,960 (993)397,216 (5,763)
Corporate and other debt securities
59,039 (556)— — 59,039 (556)
Total$459,944 $(5,535)$27,286 $(999)$487,230 $(6,534)
December 31, 2020
U.S. government agency securities
$— $— $1,479 $(13)$1,479 $(13)
Obligations of states and political subdivisions:
Obligations of states and state agencies
— — 1,010 (32)1,010 (32)
Municipal bonds6,777 (69)— — 6,777 (69)
Total obligations of states and political subdivisions
6,777 (69)1,010 (32)7,787 (101)
Residential mortgage-backed securities
41,418 (500)27,911 (273)69,329 (773)
Corporate and other debt securities
12,517 (32)— — 12,517 (32)
Total$60,712 $(601)$30,400 $(318)$91,112 $(919)
Contractual Maturities of Available for Sale Debt Securities
The contractual maturities of available for sale debt securities at December 31, 2021 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. 
 December 31, 2021
Amortized CostFair Value
 (in thousands)
Due in one year$7,057 $7,121 
Due after one year through five years30,645 31,222 
Due after five years through ten years94,221 96,722 
Due after ten years88,889 89,242 
Residential mortgage-backed securities895,279 904,502 
Total$1,116,091 $1,128,809 
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 December 31, 2021 and 2020 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
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 
December 31, 2020
U.S. Treasury securities$68,126 $7,358 $— $75,484 
U.S. government agency securities6,222 291 — 6,513 
Obligations of states and political subdivisions:
Obligations of states and state agencies262,762 8,060 (105)270,717 
Municipal bonds207,497 6,292 — 213,789 
Total obligations of states and political subdivisions470,259 14,352 (105)484,506 
Residential mortgage-backed securities1,550,306 39,603 (254)1,589,655 
Trust preferred securities37,348 50 (7,365)30,033 
Corporate and other debt securities40,750 672 (1)41,421 
Total$2,173,011 $62,326 $(7,725)$2,227,612 
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 December 31, 2021 and 2020 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, 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 subdivisions26,403 (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 securities32,627 (124)— — 32,627 (124)
Total$1,440,435 $(22,830)$242,949 $(11,242)$1,683,384 $(34,072)
December 31, 2020
Obligations of states and state agencies$5,546 $(105)$— $— $5,546 $(105)
Residential mortgage-backed securities
21,599 (245)2,470 (9)24,069 (254)
Trust preferred securities— — 28,630 (7,365)28,630 (7,365)
Corporate and other debt securities10,749 (1)— — 10,749 (1)
Total$37,894 $(351)$31,100 $(7,374)$68,994 $(7,725)
Contractual Maturities of Investments Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at December 31, 2021 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. 
 December 31, 2021
 Amortized CostFair Value
 (in thousands)
Due in one year$34,034 $34,197 
Due after one year through five years231,104 238,092 
Due after five years through ten years48,465 49,318 
Due after ten years188,952 186,697 
Residential mortgage-backed securities2,166,142 2,152,301 
Total$2,668,697 $2,660,605 
Amortized Cost of Held to Maturity Debt Securities by External Credit Rating The following table summarizes the amortized cost of held to maturity debt securities by external credit rating at December 31, 2021 and 2020.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
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 subdivisions267,222 — 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 
December 31, 2020
U.S. Treasury securities$68,126 $— $— $— $68,126 
U.S. government agency securities6,222 — — — 6,222 
Obligations of states and political subdivisions:
Obligations of states and state agencies228,286 — 5,650 28,826 262,762 
Municipal bonds166,408 — — 41,089 207,497 
Total obligations of states and political subdivisions394,694 — 5,650 69,915 470,259 
Residential mortgage-backed securities1,550,306 — — — 1,550,306 
Trust preferred securities— — — 37,348 37,348 
Corporate and other debt securities— 5,000 — 35,750 40,750 
Total$2,019,348 $5,000 $5,650 $143,013 $2,173,011 
Debt Securities, Held-to-maturity, Allowance for Credit Loss
Held to maturity 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, 2021 and 2020: 
December 31,
20212020
(in thousands)
Beginning balance$1,428 $— 
Adoption of ASU No. 2016-13 on January 1, 2020— 793
(Credit) provision for credit losses(263)635 
Ending balance$1,165 $1,428 
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 non-trading securities and net gains on trading debt securities included in earnings for the years ended December 31, 2021, 2020 and 2019 were as follows:
202120202019
 (in thousands)
Sales transactions:
Gross gains
$1,370 $665 $— 
Gross losses(550)(9)— 
Total$820 $656 $— 
Maturities and other securities transactions:
Gross gains
$10 $34 $67 
Gross losses(285)(166)(217)
Total(275)(132)(150)
Net gains on trading debt securities1,213 — — 
Net gains (losses) on securities transactions$1,758 $524 $(150)