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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
September 30, 2020
U.S. Treasury securities$50,035 $1,543 $— $51,578 
U.S. government agency securities25,302 1,164 (18)26,448 
Obligations of states and political subdivisions:
Obligations of states and state agencies58,807 1,151 (30)59,928 
Municipal bonds73,063 1,276 (74)74,265 
Total obligations of states and political subdivisions131,870 2,427 (104)134,193 
Residential mortgage-backed securities1,193,052 41,326 (942)1,233,436 
Corporate and other debt securities79,707 1,539 (337)80,909 
Total investment securities available for sale$1,479,966 $47,999 $(1,401)$1,526,564 
December 31, 2019
U.S. Treasury securities$50,952 $12 $(21)$50,943 
U.S. government agency securities28,982 280 (19)29,243 
Obligations of states and political subdivisions:
Obligations of states and state agencies78,116 540 (83)78,573 
Municipal bonds90,662 902 (86)91,478 
Total obligations of states and political subdivisions168,778 1,442 (169)170,051 
Residential mortgage-backed securities1,248,814 11,234 (5,262)1,254,786 
Corporate and other debt securities61,261 628 (111)61,778 
Total investment securities available for sale$1,558,787 $13,596 $(5,582)$1,566,801 
Age of Unrealized Losses and Fair Value of Related Debt Securities Available for Sale
The age of unrealized losses and fair value of related securities available for sale at September 30, 2020 and December 31, 2019 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (in thousands)
September 30, 2020
U.S. government agency securities$— $— $1,585 $(18)$1,585 $(18)
Obligations of states and political subdivisions:
Obligations of states and state agencies
1,319 (6)1,023 (24)2,342 (30)
Municipal bonds6,767 (74)— — 6,767 (74)
Total obligations of states and political subdivisions
8,086 (80)1,023 (24)9,109 (104)
Residential mortgage-backed securities111,973 (526)33,346 (416)145,319 (942)
Corporate and other debt securities14,656 (337)— — 14,656 (337)
Total$134,715 $(943)$35,954 $(458)$170,669 $(1,401)
December 31, 2019
U.S. Treasury securities$25,019 $(21)$— $— $25,019 $(21)
U.S. government agency securities— — 1,783 (19)1,783 (19)
Obligations of states and political subdivisions:
Obligations of states and state agencies
18,540 (21)8,755 (62)27,295 (83)
Municipal bonds— — 13,177 (86)13,177 (86)
Total obligations of states and political subdivisions
18,540 (21)21,932 (148)40,472 (169)
Residential mortgage-backed securities240,412 (1,194)282,798 (4,068)523,210 (5,262)
Corporate and other debt securities5,139 (111)— — 5,139 (111)
Total$289,110 $(1,347)$306,513 $(4,235)$595,623 $(5,582)
Contractual Maturities of Debt Securities Available for Sale
The contractual maturities of available for sale debt securities at September 30, 2020 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.
 September 30, 2020
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$20,975 $20,991 
Due after one year through five years92,873 95,436 
Due after five years through ten years107,004 108,746 
Due after ten years66,062 67,955 
Residential mortgage-backed securities1,193,052 1,233,436 
Total investment securities available for sale$1,479,966 $1,526,564 
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 September 30, 2020 and December 31, 2019 were as follows: 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
 (in thousands)
September 30, 2020
U.S. Treasury securities$138,224 $8,205 $— $146,429 
U.S. government agency securities6,302 332 — 6,634 
Obligations of states and political subdivisions:
Obligations of states and state agencies271,038 9,040 (176)279,902 
Municipal bonds193,013 6,909 — 199,922 
Total obligations of states and political subdivisions464,051 15,949 (176)479,824 
Residential mortgage-backed securities1,491,808 37,819 (924)1,528,703 
Trust preferred securities37,341 52 (7,393)30,000 
Corporate and other debt securities32,750 637 (6)33,381 
Total investment securities held to maturity$2,170,476 $62,994 $(8,499)$2,224,971 
December 31, 2019
U.S. Treasury securities$138,352 $5,761 $— $144,113 
U.S. government agency securities7,345 58 (41)7,362 
Obligations of states and political subdivisions:
Obligations of states and state agencies297,454 7,745 (529)304,670 
Municipal bonds203,251 5,696 (10)208,937 
Total obligations of states and political subdivisions500,705 13,441 (539)513,607 
Residential mortgage-backed securities1,620,119 14,803 (5,350)1,629,572 
Trust preferred securities37,324 39 (5,981)31,382 
Corporate and other debt securities32,250 454 (20)32,684 
Total investment securities held to maturity$2,336,095 $34,556 $(11,931)$2,358,720 
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 September 30, 2020 and December 31, 2019 were as follows: 
 Less than
Twelve Months		More than
Twelve Months		Total
 Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
 (in thousands)
September 30, 2020
Obligations of states and political subdivisions:
Obligations of states and state agencies
$5,493 $(176)$— $— $5,493 $(176)
Total obligations of states and political subdivisions
5,493 (176)— — 5,493 (176)
Residential mortgage-backed securities
237,070 (919)2,677 (5)239,747 (924)
Trust preferred securities— — 28,595 (7,393)28,595 (7,393)
Corporate and other debt securities7,494 (6)— — 7,494 (6)
Total$250,057 $(1,101)$31,272 $(7,398)$281,329 $(8,499)
December 31, 2019
U.S. government agency securities$5,183 $(41)$— $— $5,183 $(41)
Obligations of states and political subdivisions:
Obligations of states and state agencies
11,178 (55)32,397 (474)43,575 (529)
Municipal bonds— — 798 (10)798 (10)
Total obligations of states and political subdivisions
11,178 (55)33,195 (484)44,373 (539)
Residential mortgage-backed securities
307,885 (1,387)254,915 (3,963)562,800 (5,350)
Trust preferred securities— — 29,990 (5,981)29,990 (5,981)
Corporate and other debt securities
— — 4,980 (20)4,980 (20)
Total$324,246 $(1,483)$323,080 $(10,448)$647,326 $(11,931)
Contractual Maturities of Debt Securities Held to Maturity
The contractual maturities of investments in debt securities held to maturity at September 30, 2020 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.  
 September 30, 2020
 Amortized
Cost		Fair
Value
 (in thousands)
Due in one year$113,188 $113,628 
Due after one year through five years201,101 213,801 
Due after five years through ten years162,911 168,821 
Due after ten years201,468 200,018 
Residential mortgage-backed securities1,491,808 1,528,703 
Total investment securities held to maturity$2,170,476 $2,224,971 
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 September 30, 2020 and December 31, 2019.
AAA/AA/A RatedBBB ratedNon-investment grade ratedNon-ratedTotal
 (in thousands)
September 30, 2020
U.S. Treasury securities$138,224 $— $— $— $138,224 
U.S. government agency securities6,302 — — — 6,302 
Obligations of states and political subdivisions:
Obligations of states and state agencies233,581 — 5,669 31,788 271,038 
Municipal bonds171,766 — — 21,247 193,013 
Total obligations of states and political subdivisions
405,347 — 5,669 53,035 464,051 
Residential mortgage-backed securities1,491,808 — — — 1,491,808 
Trust preferred securities— — — 37,341 37,341 
Corporate and other debt securities— 5,000 — 27,750 32,750 
Total investment securities held to maturity$2,041,681 $5,000 $5,669 $118,126 $2,170,476 
December 31, 2019
U.S. Treasury securities$138,352 $— $— $— $138,352 
U.S. government agency securities7,345 — — — 7,345 
Obligations of states and political subdivisions:
Obligations of states and state agencies248,533 5,722 — 43,199 297,454 
Municipal bonds202,642 — — 609 203,251 
Total obligations of states and political subdivisions
451,175 5,722 — 43,808 500,705 
Residential mortgage-backed securities1,620,119 — — — 1,620,119 
Trust preferred securities— — — 37,324 37,324 
Corporate and other debt securities— 5,000 — 27,250 32,250 
Total investment securities held to maturity$2,216,991 $10,722 $— $108,382 $2,336,095