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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES (Tables)
6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Securities Available for Sale, Held to Maturity, and Marketable Equity Securities
The following is a summary of securities available for sale, held to maturity, and marketable equity securities:
(In thousands)Amortized  CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair ValueAllowance
June 30, 2023    
Securities available for sale    
U.S Treasuries$7,979 $$— $7,981 
Municipal bonds and obligations
65,840 275 (2,493)63,622 — 
Agency collateralized mortgage obligations 591,299 — (99,959)491,340 — 
Agency mortgage-backed securities
611,157 — (92,605)518,552 — 
Agency commercial mortgage-backed securities
258,283 — (38,506)219,777 — 
Corporate bonds
43,331 60 (4,988)38,403 — 
Other bonds and obligations
655 67 (66)656 — 
Total securities available for sale1,578,544 404 (238,617)1,340,331 — 
Securities held to maturity    
Municipal bonds and obligations
259,843 401 (21,405)238,839 49 
Agency collateralized mortgage obligations 120,349 — (20,469)99,880 — 
Agency mortgage-backed securities
49,231 — (8,973)40,258 — 
Agency commercial mortgage-backed securities
132,320 — (25,272)107,048 — 
Tax advantaged economic development bonds
1,734 (94)1,647 22 
Other bonds and obligations
288 — — 288 — 
Total securities held to maturity563,765 408 (76,213)487,960 71 
Marketable equity securities15,035 — (2,167)12,868 — 
Total$2,157,344 $812 $(316,997)$1,841,159 $71 
(In thousands)Amortized  CostGross
Unrealized
Gains
Gross
Unrealized
Losses
Fair ValueAllowance
December 31, 2022    
Securities available for sale    
U.S Treasuries$11,972 $$— $11,973 $— 
Municipal bonds and obligations
65,943 422 (3,030)63,335 — 
Agency collateralized mortgage obligations 631,732 — (99,787)531,945 — 
Agency mortgage-backed securities
643,308 (96,996)546,313 — 
Agency commercial mortgage-backed securities
264,218 — (35,750)228,468 — 
Corporate bonds
43,368 80 (2,938)40,510 — 
Other bonds and obligations
655 67 (66)656 — 
Total securities available for sale1,661,196 571 (238,567)1,423,200 — 
Securities held to maturity    
Municipal bonds and obligations
266,793 691 (23,704)243,780 66 
Agency collateralized mortgage obligations 128,136 — (20,420)107,716 — 
Agency mortgage-backed securities
50,958 — (9,240)41,718 — 
Agency commercial mortgage-backed securities
135,206 — (23,203)112,003 — 
Tax advantaged economic development bonds
2,069 (121)1,956 25 
Other bonds and obligations
291 — — 291 — 
Total securities held to maturity583,453 699 (76,688)507,464 91 
Marketable equity securities15,035 — (2,179)12,856 — 
Total$2,259,684 $1,270 $(317,434)$1,943,520 $91 
Schedule of Debt Securities, Held-to-maturity, Allowance for Credit Loss
The following table summarizes the activity in the allowance for credit losses for debt securities held to maturity by security type for the three and six months ended June 30, 2023 and 2022:
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at March 31, 2023$49 $22 $71 
(Benefit)/provision for credit losses— — — 
Balance at June 30, 2023$49 $22 $71 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at March 31, 2022$67 $32 $99 
(Benefit)/provision for credit losses(1)(4)(5)
Balance at June 30, 2022$66 $28 $94 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at December 31, 2022$66 $25 $91 
(Benefit)/provision for credit losses(17)(3)(20)
Balance at June 30, 2023$49 $22 $71 
(In thousands)Municipal bonds and obligationsTax advantaged economic development bondsTotal
Balance at December 31, 2021$70 $35 $105 
(Benefit)/provision for credit losses(4)(7)(11)
Balance at June 30, 2022$66 $28 $94 
Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) and Held to Maturity (HTM) Securities, Segregated by Contractual Maturity
The amortized cost and estimated fair value of available for sale (“AFS”) and held to maturity (“HTM”) securities segregated by contractual maturity at June 30, 2023 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. Mortgage-backed securities are shown in total, as their maturities are highly variable.
 Available for saleHeld to maturity
 AmortizedFairAmortizedFair
(In thousands)CostValueCostValue
Within 1 year$8,799 $8,800 $894 $894 
Over 1 year to 5 years10,866 10,754 2,309 2,298 
Over 5 years to 10 years54,612 49,747 36,477 36,281 
Over 10 years43,528 41,361 222,185 201,301 
Total bonds and obligations117,805 110,662 261,865 240,774 
Mortgage-backed securities1,460,739 1,229,669 301,900 247,186 
Total$1,578,544 $1,340,331 $563,765 $487,960 
Schedule of Securities with Unrealized Losses, Segregated by the Duration of their Continuous Unrealized Loss Positions
Securities available for sale and held to maturity with unrealized losses, segregated by the duration of their continuous unrealized loss positions, are summarized as follows:
 Less Than Twelve MonthsOver Twelve MonthsTotal
 Gross Gross Gross 
 UnrealizedFairUnrealizedFairUnrealizedFair
(In thousands)LossesValueLossesValueLossesValue
June 30, 2023      
Securities available for sale      
Municipal bonds and obligations
$550 $24,993 $1,943 $17,862 $2,493 $42,855 
Agency collateralized mortgage obligations
113 2,276 99,846 489,064 99,959 491,340 
Agency mortgage-backed securities
157 2,648 92,448 515,824 92,605 518,472 
Agency commercial mortgage-backed securities1,042 9,678 37,464 210,099 38,506 219,777 
Corporate bonds
1,064 12,797 3,924 24,698 4,988 37,495 
Other bonds and obligations
— — 66 295 66 295 
Total securities available for sale$2,926 $52,392 $235,691 $1,257,842 $238,617 $1,310,234 
Securities held to maturity      
Municipal bonds and obligations$1,710 $89,477 $19,695 $74,807 $21,405 $164,284 
Agency collateralized mortgage obligations1,709 34,330 18,760 65,550 20,469 99,880 
Agency mortgage-backed securities— — 8,973 40,258 8,973 40,258 
Agency commercial mortgage-backed securities— — 25,272 107,048 25,272 107,048 
Tax advantaged economic development bonds
— — 94 962 94 962 
Total securities held to maturity3,419 123,807 72,794 288,625 76,213 412,432 
Total$6,345 $176,199 $308,485 $1,546,467 $314,830 $1,722,666 
December 31, 2022      
Securities available for sale      
Municipal bonds and obligations
$2,406 $36,696 $624 $2,763 $3,030 $39,459 
Agency collateralized mortgage obligations
23,052 247,509 76,735 284,434 99,787 531,943 
Agency mortgage-backed securities
3,124 37,540 93,872 508,683 96,996 546,223 
Agency commercial mortgage-backed securities9,885 96,396 25,865 132,043 35,750 228,439 
Corporate bonds
1,709 25,657 1,229 9,929 2,938 35,586 
Other bonds and obligations
— — 66 295 66 295 
Total securities available for sale$40,176 $443,798 $198,391 $938,147 $238,567 $1,381,945 
Securities held to maturity      
Municipal bonds and obligations
$5,476 $125,494 $18,228 $38,341 $23,704 $163,835 
Agency collateralized mortgage obligations
2,734 49,539 17,686 58,177 20,420 107,716 
Agency mortgage-backed securities
300 2,419 8,940 39,299 9,240 41,718 
Agency commercial mortgage-backed securities
447 9,713 22,756 102,290 23,203 112,003 
Tax advantaged economic development bonds
142 120 1,008 121 1,150 
Total securities held to maturity8,958 187,307 67,730 239,115 76,688 426,422 
Total$49,134 $631,105 $266,121 $1,177,262 $315,255 $1,808,367