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SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2022
Amortized Cost of HTM Securities by Security Type and Credit Rating | 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
Gross Realized Gain and Losses on the Sale of Securities | 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
Available-for-sale Securities |
Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities | 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
Schedule of Gross Unrealized Losses and Fair Value of Investments | 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
Schedule of Amortized Cost and Estimated Fair Value of Securities | ​ 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
Held-to-maturity Securities |
Schedule of Amortized Cost and Estimated Fair Value of Securities | 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
Schedule of Carrying Values, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities | 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

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