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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investment Securities |
Schedule of amortized cost and fair value of investment securities held to maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross |  | Gross | ​ | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 25,000 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 25,001 | ​
Mortgage-backed securities** | ​ | ​ | 930,542 | ​ | ​ | 2,763 | ​ | ​ | (1,123) | ​ | ​ | 932,182 | ​
​ | ​ | $ | 955,542 | ​ | $ | 2,764 | ​ | $ | (1,123) | ​ | $ | 957,183 | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State and municipal obligations | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
Schedule of amortized cost and fair value of investment securities available for sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 29,882 | ​ | $ | 16 | ​ | $ | (642) | ​ | $ | 29,256 | ​
State and municipal obligations | ​ |  | 502,575 | ​ |  | 17,491 | ​ |  | (27) | ​ |  | 520,039 | ​
Mortgage-backed securities** | ​ |  | 2,722,018 | ​ |  | 49,153 | ​ |  | (3,496) | ​ |  | 2,767,675 | ​
Corporate securities | ​ | ​ | 13,562 | ​ | ​ | 140 | ​ | ​ | — | ​ | ​ | 13,702 | ​
​ | ​ | $ | 3,268,037 | ​ | $ | 66,800 | ​ | $ | (4,165) | ​ | $ | 3,330,672 | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt* | ​ | $ | 25,356 | ​ | $ | 585 | ​ | $ | — | ​ | $ | 25,941 | ​
State and municipal obligations | ​ |  | 204,150 | ​ |  | 5,029 | ​ |  | (764) | ​ |  | 208,415 | ​
Mortgage-backed securities** | ​ |  | 1,711,257 | ​ |  | 14,209 | ​ |  | (3,775) | ​ |  | 1,721,691 | ​
​ | ​ | $ | 1,940,763 | ​ | $ | 19,823 | ​ | $ | (4,539) | ​ | $ | 1,956,047 | ​
* The Company’s government-sponsored entities holdings are comprised of debt securities offered by Federal Home Loan Mortgage Corporation (“FHLMC”) or Freddie Mac, Federal National Mortgage Association (“FNMA”) or Fannie Mae, FHLB, and Federal Farm Credit Banks (“FFCB”). ** All of the mortgage-backed securities are issued by government-sponsored entities; there are no private-label holdings. Also included in the Company’s government-sponsored entities are debt securities offered by the Small Business Administration (“SBA”), which have the full faith and credit backing of the United States Government. ​
Schedule of amortized cost and carrying value of other investment securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Carrying |
(Dollars in thousands) |  | Value |
December 31, 2020: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 15,083 | ​
Federal Reserve Bank stock | ​ | ​ | 129,871 | ​
Investment in unconsolidated subsidiaries | ​ |  | 4,941 | ​
Other nonmarketable investment securities | ​ |  | 10,548 | ​
​ | ​ | $ | 160,443 | ​
December 31, 2019: | ​ | ​ | ​ | ​
Federal Home Loan Bank stock | ​ | $ | 43,044 | ​
Investment in unconsolidated subsidiaries | ​ |  | 3,563 | ​
Other nonmarketable investment securities | ​ |  | 2,517 | ​
​ | ​ | $ | 49,124 | ​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities | ​ | Securities |
​ | ​ | Held-to-maturity | ​ | Available-for-sale |
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Value |  | Cost |  | Value |
Due in one year or less |  | $ | — | ​ | $ | — |  | $ | 9,669 |  | $ | 9,698 | ​
Due after one year through five years | ​ |  | — | ​ |  | — | ​ |  | 80,846 | ​ |  | 83,586 | ​
Due after five years through ten years | ​ |  | 88,735 | ​ |  | 89,007 | ​ |  | 525,547 | ​ |  | 539,905 | ​
Due after ten years | ​ |  | 866,807 | ​ |  | 868,176 | ​ |  | 2,651,975 | ​ |  | 2,697,483 | ​
​ | ​ | $ | 955,542 | ​ | $ | 957,183 | ​ | $ | 3,268,037 | ​ | $ | 3,330,672 | ​
Schedule of information with respect to sales of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018 |
Securities Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Sale proceeds |  | $ | 100,754 |  | $ | 242,733 |  | $ | 73,054 | ​
Gross realized gains | ​ | ​ | 662 | ​ | ​ | 6,030 | ​ | ​ | 31 | ​
Gross realized losses | ​ |  | (612) | ​ |  | (3,319) | ​ |  | (686) | ​
Net realized gain (loss) | ​ | $ | 50 | ​ | $ | 2,711 | ​ | $ | (655) | ​
Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than | ​ | Twelve Months |
​ | ​ | Twelve Months | ​ | or More |
​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ |
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |
December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities | ​ | $ | 1,123 | ​ | $ | 240,591 | ​ | $ | — | ​ | $ | — | ​
​ | ​ | $ | 1,123 | ​ | $ | 240,591 | ​ | $ | — | ​ | $ | — | ​
Securities Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt | ​ | $ | 642 | ​ | $ | 24,358 | ​ | $ | — | ​ | $ | — | ​
State and municipal obligations | ​ |  | 27 | ​ |  | 8,620 | ​ |  | — | ​ |  | — | ​
Mortgage-backed securities | ​ |  | 2,475 | ​ |  | 509,319 | ​ |  | 1,021 | ​ |  | 105,125 | ​
​ | ​ | $ | 3,144 | ​ | $ | 542,297 | ​ | $ | 1,021 | ​ | $ | 105,125 | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government-sponsored entities debt | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
State and municipal obligations | ​ |  | 764 | ​ |  | 42,070 | ​ |  | — | ​ |  | — | ​
Mortgage-backed securities | ​ |  | 2,422 | ​ |  | 461,658 | ​ |  | 1,353 | ​ |  | 141,982 | ​
​ | ​ | $ | 3,186 | ​ | $ | 503,728 | ​ | $ | 1,353 | ​ | $ | 141,982 | ​

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