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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Estimated Fair Value and Allowance for Credit Loss on Investments in Debt Securities
The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables:
March 31, 2025
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,242,037 $288 $(147,835)$1,094,490 
Obligations of states and political subdivisions241,062 42 (27,905)213,199 
Corporate bonds6,184 26 (229)5,981 
Asset backed securities285,784 239 (1,513)284,510 
Non-agency collateralized mortgage obligations279,559 207 (25,596)254,170 
Total debt securities available for sale$2,054,626 $802 $(203,078)$1,852,350 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$104,146 $3 $(5,775)98,374 
Obligations of states and political subdivisions2,722 2 (82)2,642 
Total debt securities held to maturity$106,868 $5 $(5,857)$101,016 
December 31, 2024
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,268,654 $16 $(174,485)$1,094,185 
Obligations of states and political subdivisions249,627 66 (28,949)220,744 
Corporate bonds6,182 — (345)5,837 
Asset backed securities314,814 687 (1,238)314,263 
Non-agency collateralized mortgage obligations299,256 238 (29,638)269,856 
Total debt securities available for sale$2,138,533 $1,007 $(234,655)$1,904,885 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$109,155 $3 $(7,443)$101,715 
Obligations of states and political subdivisions2,711 2 (79)2,634 
Total debt securities held to maturity$111,866 $5 $(7,522)$104,349 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of March 31, 2025, the contractual final maturity for available for sale and held to maturity investment securities is as follows:
Debt SecuritiesAvailable for SaleHeld to Maturity
(in thousands)Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
Due in one year$6,847 $6,749 $1,158 $1,159 
Due after one year through five years51,271 49,281 2,694 2,628 
Due after five years through ten years176,291 165,236 102,035 96,297 
Due after ten years1,820,217 1,631,084 981 932 
Totals$2,054,626 $1,852,350 $106,868 $101,016 
Gross Unrealized Losses on Investment Securities
Gross unrealized losses on debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
March 31, 2025:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$46,095 $(101)$1,008,710 $(147,734)$1,054,805 $(147,835)
Obligations of states and political subdivisions10,493 (415)199,107 (27,490)209,600 (27,905)
Corporate bonds— — 4,710 (229)4,710 (229)
Asset backed securities88,756 (176)76,155 (1,337)164,911 (1,513)
Non-agency collateralized mortgage obligations— — 221,288 (25,596)221,288 (25,596)
Total debt securities available for sale$145,344 $(692)$1,509,970 $(202,386)$1,655,314 $(203,078)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $98,213 $(5,775)$98,213 $(5,775)
Obligations of states and political subdivisions— — 1,482 (82)1,482 (82)
Total debt securities held to maturity$— $— $99,695 $(5,857)$99,695 $(5,857)
December 31, 2024:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$63,714 $(842)$1,021,654 $(173,643)$1,085,368 $(174,485)
Obligations of states and political subdivisions7,457 (140)208,063 (28,809)215,520 (28,949)
Corporate bonds1,229 (17)4,608 (328)5,837 (345)
Asset backed securities44,707 (30)75,734 (1,208)120,441 (1,238)
Non-agency collateralized mortgage obligations— — 236,671 (29,638)236,671 (29,638)
Total debt securities available for sale$117,107 $(1,029)$1,546,730 $(233,626)$1,663,837 $(234,655)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$— $— $101,553 $(7,443)$101,553 $(7,443)
Obligations of states and political subdivisions— — 1,485 (79)1,485 (79)
Total debt securities held to maturity$— $— $103,038 $(7,522)$103,038 $(7,522)
Amortized Cost of Debt Securities Held-to-Maturity The following table summarizes the amortized cost of debt securities held-to-maturity at the dates indicated, aggregated by credit quality indicator:
March 31, 2025December 31, 2024
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$104,146 $— $109,155 $— 
Obligations of states and political subdivisions2,722 — 2,711 — 
Total debt securities held to maturity$106,868 $— $111,866 $—