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SECURITIES | 3 Months Ended
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Mar. 31, 2022
Securities [Abstract] |
SECURITIES | 2. SECURITIES Available for Sale ​ The Company’s AFS investment portfolio is generally highly-rated or agency backed. All AFS securities were current with no securities past due or on non-accrual as of March 31, 2022 and December 31, 2021. ​ The amortized cost, gross unrealized gains and losses, and estimated fair values of AFS securities as of March 31, 2022 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | (Losses) |  | Fair Value
March 31, 2022 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 72,068 | ​ | $ | — | ​ | $ | (4,029) | ​ | $ | 68,039
Obligations of states and political subdivisions | ​ |  | 967,219 | ​ |  | 8,336 | ​ |  | (87,255) | ​ |  | 888,300
Corporate and other bonds (1) | ​ |  | 185,884 | ​ |  | 802 | ​ |  | (2,763) | ​ |  | 183,923
Commercial MBS | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Agency | ​ | ​ | 342,966 | ​ |  | 978 | ​ |  | (15,592) | ​ | ​ | 328,352
Non-agency | ​ | ​ | 108,462 | ​ |  | — | ​ |  | (2,323) | ​ | ​ | 106,139
Total commercial MBS | ​ | ​ | 451,428 | ​ |  | 978 | ​ |  | (17,915) | ​ | ​ | 434,491
Residential MBS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,634,860 | ​ |  | 2,401 | ​ |  | (103,848) | ​ | ​ | 1,533,413
Non-agency | ​ | ​ | 86,876 | ​ |  | 6 | ​ |  | (3,413) | ​ | ​ | 83,469
Total residential MBS | ​ | ​ | 1,721,736 | ​ |  | 2,407 | ​ |  | (107,261) | ​ | ​ | 1,616,882
Other securities | ​ |  | 1,645 | ​ |  | — | ​ |  | — | ​ |  | 1,645
Total AFS securities | ​ | $ | 3,399,980 | ​ | $ | 12,523 | ​ | $ | (219,223) | ​ | $ | 3,193,280
(1) Other bonds include asset-backed securities The amortized cost, gross unrealized gains and losses, and estimated fair values of AFS securities as of December 31, 2021 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | (Losses) |  | Fair Value
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agency securities | ​ | $ | 73,830 | ​ | $ | 179 | ​ | $ | (160) | ​ | $ | 73,849
Obligations of states and political subdivisions | ​ | ​ | 971,126 | ​ | ​ | 39,343 | ​ | ​ | (2,073) | ​ | ​ | 1,008,396
Corporate and other bonds (1) | ​ |  | 150,201 | ​ |  | 3,353 | ​ |  | (178) | ​ |  | 153,376
Commercial MBS | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Agency | ​ | ​ | 361,806 | ​ | ​ | 6,761 | ​ | ​ | (4,215) | ​ | ​ | 364,352
Non-agency | ​ | ​ | 107,087 | ​ | ​ | 139 | ​ | ​ | (421) | ​ | ​ | 106,805
Total commercial MBS | ​ | ​ | 468,893 | ​ | ​ | 6,900 | ​ | ​ | (4,636) | ​ | ​ | 471,157
Residential MBS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,691,651 | ​ | ​ | 15,180 | ​ | ​ | (24,337) | ​ | ​ | 1,682,494
Non-agency | ​ | ​ | 91,443 | ​ | ​ | 243 | ​ | ​ | (948) | ​ | ​ | 90,738
Total residential MBS | ​ | ​ | 1,783,094 | ​ | ​ | 15,423 | ​ | ​ | (25,285) | ​ | ​ | 1,773,232
Other securities | ​ |  | 1,640 | ​ |  | — | ​ |  | — | ​ |  | 1,640
Total AFS securities | ​ | $ | 3,448,784 | ​ | $ | 65,198 | ​ | $ | (32,332) | ​ | $ | 3,481,650
(1) Other bonds include asset-backed securities ​ The following table shows the gross unrealized losses and fair value of the Company’s AFS securities with unrealized losses for which an ACL has not been recorded at March 31, 2022 and December 31, 2021 and that are not deemed to be impaired as of those dates. These are aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | More than 12 months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
​ | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
March 31, 2022 | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
U.S. government and agency securities | ​ | $ | 64,366 | ​ | $ | (3,972) | ​ | $ | 3,604 | ​ | $ | (57) | ​ | $ | 67,970 | ​ | $ | (4,029)
Obligations of states and political subdivisions | ​ | ​ | 533,491 | ​ | ​ | (79,311) | ​ | ​ | 31,225 | ​ | ​ | (7,944) | ​ | ​ | 564,716 | ​ | ​ | (87,255)
Corporate and other bonds(1) | ​ |  | 112,253 | ​ |  | (2,763) | ​ |  | — | ​ |  | — | ​ |  | 112,253 | ​ |  | (2,763)
Commercial MBS | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 175,651 | ​ | ​ | (11,545) | ​ | ​ | 40,654 | ​ | ​ | (4,047) | ​ | ​ | 216,305 | ​ | ​ | (15,592)
Non-agency | ​ | ​ | 87,127 | ​ | ​ | (1,526) | ​ | ​ | 19,013 | ​ | ​ | (797) | ​ | ​ | 106,140 | ​ | ​ | (2,323)
Total commercial MBS | ​ | ​ | 262,778 | ​ | ​ | (13,071) | ​ | ​ | 59,667 | ​ | ​ | (4,844) | ​ | ​ | 322,445 | ​ | ​ | (17,915)
Residential MBS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,016,786 | ​ | ​ | (71,954) | ​ | ​ | 333,594 | ​ | ​ | (31,894) | ​ | ​ | 1,350,380 | ​ | ​ | (103,848)
Non-agency | ​ | ​ | 63,140 | ​ | ​ | (2,550) | ​ | ​ | 12,162 | ​ | ​ | (863) | ​ | ​ | 75,302 | ​ | ​ | (3,413)
Total residential MBS | ​ | ​ | 1,079,926 | ​ | ​ | (74,504) | ​ | ​ | 345,756 | ​ | ​ | (32,757) | ​ | ​ | 1,425,682 | ​ | ​ | (107,261)
Total AFS securities | ​ | $ | 2,052,814 | ​ | $ | (173,621) | ​ | $ | 440,252 | ​ | $ | (45,602) | ​ | $ | 2,493,066 | ​ | $ | (219,223)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government and agency securities | ​ | $ | 64,474 | ​ | $ | (115) | ​ | $ | 3,900 | ​ | $ | (45) | ​ | $ | 68,374 | ​ | $ | (160)
Obligations of states and political subdivisions | ​ | ​ | 249,701 | ​ | ​ | (2,020) | ​ | ​ | 2,123 | ​ | ​ | (53) | ​ | ​ | 251,824 | ​ | ​ | (2,073)
Corporate and other bonds(1) | ​ |  | 21,134 | ​ |  | (177) | ​ |  | 703 | ​ |  | (1) | ​ |  | 21,837 | ​ |  | (178)
Commercial MBS | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Agency | ​ | ​ | 175,588 | ​ | ​ | (4,053) | ​ | ​ | 3,172 | ​ | ​ | (162) | ​ | ​ | 178,760 | ​ | ​ | (4,215)
Non-agency | ​ | ​ | 33,759 | ​ | ​ | (313) | ​ | ​ | 11,029 | ​ | ​ | (108) | ​ | ​ | 44,788 | ​ | ​ | (421)
Total commercial MBS | ​ | ​ | 209,347 | ​ | ​ | (4,366) | ​ | ​ | 14,201 | ​ | ​ | (270) | ​ | ​ | 223,548 | ​ | ​ | (4,636)
Residential MBS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,140,701 | ​ | ​ | (21,147) | ​ | ​ | 106,104 | ​ | ​ | (3,190) | ​ | ​ | 1,246,805 | ​ | ​ | (24,337)
Non-agency | ​ | ​ | 48,392 | ​ | ​ | (584) | ​ | ​ | 12,716 | ​ | ​ | (364) | ​ | ​ | 61,108 | ​ | ​ | (948)
Total residential MBS | ​ | ​ | 1,189,093 | ​ | ​ | (21,731) | ​ | ​ | 118,820 | ​ | ​ | (3,554) | ​ | ​ | 1,307,913 | ​ | ​ | (25,285)
Total AFS securities | ​ | $ | 1,733,749 | ​ | $ | (28,409) | ​ | $ | 139,747 | ​ | $ | (3,923) | ​ | $ | 1,873,496 | ​ | $ | (32,332)
(1) Other bonds include asset-backed securities As of March 31, 2022, there were $440.3 million AFS securities, comprised of 106 individual securities that had been in a continuous loss position for more than 12 months and had an aggregate unrealized loss of approximately $45.6 million. As of December 31, 2021, there were $139.7 million AFS securities, comprised of 33 individual securities that had been in a continuous loss position for more than 12 months and had an aggregate unrealized loss of $3.9 million. The Company has evaluated AFS securities in an unrealized loss position for credit related impairment at March 31, 2022 and December 31, 2021 and concluded no impairment existed based on several factors which included: (1) the majority of these securities are of high credit quality, (2) unrealized losses are primarily the result of market volatility and increases in market interest rates, (3) the contractual terms of the investments do not permit the issuer(s) to settle the securities at a price less than the cost basis of each investment, (4) issuers continue to make timely principal and interest payments, and (5) the Company does not intend to sell any of the investments and the accounting standard of “more likely than not” has not been met for the Company to be required to sell any of the investments before recovery of its amortized cost basis. Additionally, the majority of the Company’s MBS are issued by FNMA, FHLMC, and GNMA and do not have credit risk given the implicit and explicit government guarantees associated with these agencies. In addition, the non-agency mortgage-backed and asset-backed securities generally received a 20% SSFA rating. ​ The following table presents the amortized cost and estimated fair value of AFS securities as of March 31, 2022 and December 31, 2021, by contractual maturity (dollars in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021
​ |  | Amortized |  | Estimated |  | Amortized |  | Estimated
​ | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | 23,826 | ​ | $ | 23,702 | ​ | $ | 18,247 | ​ | $ | 18,317
Due after one year through five years | ​ |  | 179,752 | ​ |  | 179,192 | ​ |  | 180,080 | ​ |  | 183,981
Due after five years through ten years | ​ |  | 344,061 | ​ |  | 335,913 | ​ |  | 324,615 | ​ |  | 331,215
Due after ten years | ​ |  | 2,852,341 | ​ |  | 2,654,473 | ​ |  | 2,925,842 | ​ |  | 2,948,137
Total AFS securities | ​ | $ | 3,399,980 | ​ | $ | 3,193,280 | ​ | $ | 3,448,784 | ​ | $ | 3,481,650
​ Refer to Note 7 "Commitments and Contingencies" in Part I, Item I of this Quarterly Report for information regarding the estimated fair value of AFS securities that were pledged to secure public deposits, repurchase agreements, and for other purposes as permitted or required by law as of March 31, 2022 and December 31, 2021. Held to Maturity ​ The Company’s HTM investment portfolio primarily consists of highly-rated municipal securities. The Company’s HTM securities were all current, with no securities past due or on non-accrual at March 31, 2022 and December 31, 2021. ​ The Company reports HTM securities on the Company’s Consolidated Balance Sheets at carrying value. Carrying value is amortized cost, which includes any unamortized unrealized gains and losses recognized in AOCI prior to reclassifying the securities from AFS securities to HTM securities. Investment securities transferred into the HTM category from the AFS category are recorded at fair value at the date of transfer. The unrealized holding gains or losses at the date of transfer are retained in AOCI and in the carrying value of the HTM securities. Such unrealized gains or losses are accreted over the remaining life of the security with no impact on future net income. ​ The carrying value, gross unrealized gains and losses, and estimated fair values of HTM securities as of March 31, 2022 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) | ​ | Fair Value
March 31, 2022 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 2,483 | ​ | $ | — | ​ | $ | (74) | ​ | $ | 2,409
Obligations of states and political subdivisions | ​ | ​ | 684,294 | ​ | ​ | 24,828 | ​ | ​ | (17,616) | ​ | ​ | 691,506
Commercial MBS | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 31,221 | ​ | ​ | — | ​ | ​ | (1,697) | ​ | ​ | 29,524
Total commercial MBS | ​ | ​ | 31,221 | ​ | ​ | — | ​ | ​ | (1,697) | ​ | ​ | 29,524
Residential MBS | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 38,874 | ​ | ​ | — | ​ | ​ | (2,136) | ​ | ​ | 36,738
Total residential MBS | ​ | ​ | 38,874 | ​ | ​ | — | ​ | ​ | (2,136) | ​ | ​ | 36,738
Total held-to-maturity securities | ​ | $ | 756,872 | ​ | $ | 24,828 | ​ | $ | (21,523) | ​ | $ | 760,177
​ The carrying value, gross unrealized gains and losses, and estimated fair values of HTM securities as of December 31, 2021 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) |  | Fair Value
December 31, 2021 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government and agency securities | ​ | $ | 2,604 | ​ | $ | — | ​ | $ | (29) | ​ | $ | 2,575
Obligations of states and political subdivisions | ​ | ​ | 620,873 | ​ | ​ | 65,982 | ​ | ​ | (121) | ​ | ​ | 686,734
Commercial MBS | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Agency | ​ | ​ | 4,523 | ​ | ​ | — | ​ | ​ | (58) | ​ | ​ | 4,465
Total commercial MBS | ​ | ​ | 4,523 | ​ | ​ | — | ​ | ​ | (58) | ​ | ​ | 4,465
Total held-to-maturity securities | ​ | $ | 628,000 | ​ | $ | 65,982 | ​ | $ | (208) | ​ | $ | 693,774
​ Credit Quality Indicators & Allowance for Credit Losses - HTM ​ For HTM securities, the Company evaluates the credit risk of its securities on at least a quarterly basis. The Company estimates expected credit losses on HTM debt securities on an individual basis based on the PD/LGD methodology primarily using security-level credit ratings. The Company’s HTM securities ACL was immaterial at March 31, 2022 and December 31, 2021. The primary indicators of credit quality for the Company’s HTM portfolio are security type and credit rating, which is influenced by a number of factors including obligor cash flow, geography, seniority, and others. The Company’s only HTM securities with credit risk are obligations of states and political subdivisions. ​ The following table presents the amortized cost of HTM securities as of March 31, 2022 and December 31, 2021 by security type and credit rating (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | U.S. Government and Agency |  | Obligations of states and political |  | Mortgage-backed |  | Total HTM
​ | ​ | securities | ​ | subdivisions | ​ | securities | ​ | securities
March 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit Rating: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
AAA/AA/A | ​ | $ | — | ​ | $ | 684,294 | ​ | $ | — | ​ | $ | 684,294
Not Rated - Agency(1) | ​ | ​ | 2,483 | ​ | ​ | — | ​ | ​ | 70,095 | ​ | ​ | 72,578
Total | ​ | $ | 2,483 | ​ | $ | 684,294 | ​ | $ | 70,095 | ​ | $ | 756,872
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit Rating: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
AAA/AA/A | ​ | $ | — | ​ | $ | 620,873 | ​ | $ | — | ​ | $ | 620,873
Not Rated - Agency(1) | ​ | ​ | 2,604 | ​ | ​ | — | ​ | ​ | 4,523 | ​ | ​ | 7,127
Total | ​ | $ | 2,604 | ​ | $ | 620,873 | ​ | $ | 4,523 | ​ | $ | 628,000
(1) Generally considered not to have credit risk given the government guarantees associated with these agencies ​ The following table presents the amortized cost and estimated fair value of HTM securities as of March 31, 2022 and December 31, 2021, by contractual maturity (dollars in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
​ | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Due in one year or less | ​ | $ | 5,061 | ​ | $ | 5,018 | ​ | $ | 3,034 | ​ | $ | 3,027
Due after one year through five years | ​ |  | 10,381 | ​ |  | 10,827 | ​ |  | 5,852 | ​ |  | 6,065
Due after five years through ten years | ​ |  | 15,877 | ​ |  | 16,537 | ​ |  | 14,019 | ​ |  | 15,984
Due after ten years | ​ |  | 725,553 | ​ |  | 727,795 | ​ |  | 605,095 | ​ |  | 668,698
Total HTM securities | ​ | $ | 756,872 | ​ | $ | 760,177 | ​ | $ | 628,000 | ​ | $ | 693,774
​ Refer to Note 7 "Commitments and Contingencies" in Part I, Item I of this Quarterly Report for information regarding the estimated fair value of HTM securities that were pledged to secure public deposits as permitted or required by law as of March 31, 2022 and December 31, 2021. Restricted Stock, at cost Due to restrictions placed upon the Bank’s common stock investment in the FRB and FHLB, these securities have been classified as restricted equity securities and carried at cost. These restricted securities are not subject to the investment security classifications and are included as a separate line item on the Company’s Consolidated Balance Sheets. Restricted stock consists of FRB stock in the amount of $67.0 million for March 31, 2022 and December 31, 2021 and FHLB stock in the amount of $10.0 million and $9.8 million as of March 31, 2022 and December 31, 2021, respectively. Realized Gains and Losses The following table presents the gross realized gains and losses on and the proceeds from the sale of securities during the three months ended March 31, 2022 and 2021 (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Three Months Ended
​ | ​ | March 31, 2022 | ​ | March 31, 2021
Realized gains (losses)(1): |  | ​ |  |  | ​ |
Gross realized gains | ​ | $ | — | ​ | $ | 138
Gross realized losses | ​ |  | — | ​ |  | (60)
Net realized gains | ​ | $ | — | ​ | $ | 78
​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | $ | — | ​ | $ | 45,436
(1) Includes gains (losses) on sales and calls of securities ​

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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