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Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] | The following table summarizes the Company’s portfolio of securities held-to-maturity at June 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Allowance
​ | ​ | Amortized | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | for Credit
​ |  | Cost |  | Fair Value |  | Gains |  | Losses |  | Losses
​ | ​ | (In thousands)
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipals | ​ | $ | 50,480 | ​ | $ | 52,532 | ​ | $ | 2,214 | ​ | $ | 162 | ​ | $ | (402)
Total other securities | ​ |  | 50,480 | ​ |  | 52,532 | ​ |  | 2,214 | ​ |  | 162 | ​ |  | (402)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
FNMA | ​ |  | 7,924 | ​ |  | 9,126 | ​ |  | 1,202 | ​ |  | — | ​ |  | —
Total mortgage-backed securities | ​ |  | 7,924 | ​ |  | 9,126 | ​ |  | 1,202 | ​ |  | — | ​ |  | —
Total | ​ | $ | 58,404 | ​ | $ | 61,658 | ​ | $ | 3,416 | ​ | $ | 162 | ​ | $ | (402)
​ The following table summarizes the Company’s portfolio of securities held-to-maturity at December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross
​ | ​ | Amortized | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ |  | Cost |  | Fair Value |  | Gains |  | Losses
​ | ​ | (In thousands)
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipals | ​ | $ | 50,954 | ​ | $ | 53,998 | ​ | $ | 3,044 | ​ | $ | —
Total other securities | ​ |  | 50,954 | ​ |  | 53,998 | ​ |  | 3,044 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
FNMA | ​ |  | 7,934 | ​ |  | 8,114 | ​ |  | 180 | ​ |  | —
Total mortgage-backed securities | ​ |  | 7,934 | ​ |  | 8,114 | ​ |  | 180 | ​ |  | —
Total | ​ | $ | 58,888 | ​ | $ | 62,112 | ​ | $ | 3,224 | ​ | $ | —
​ The following table summarizes the Company’s portfolio of securities available for sale at June 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross
​ | ​ | Amortized | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ |  | Cost |  | Fair Value |  | Gains |  | Losses
​ | ​ | (In thousands)
Securities available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate | ​ | $ | 130,000 | ​ | $ | 120,764 | ​ | $ | 229 | ​ | $ | 9,465
Municipals | ​ |  | 3,704 | ​ |  | 3,712 | ​ |  | 8 | ​ |  | —
Mutual funds | ​ |  | 12,639 | ​ |  | 12,639 | ​ |  | — | ​ |  | —
Collateralized loan obligations | ​ |  | 100,372 | ​ |  | 94,620 | ​ |  | — | ​ |  | 5,752
Other | ​ |  | 1,068 | ​ |  | 1,068 | ​ |  | — | ​ |  | —
Total other securities | ​ |  | 247,783 | ​ |  | 232,803 | ​ |  | 237 | ​ |  | 15,217
REMIC and CMO | ​ |  | 241,196 | ​ |  | 248,682 | ​ |  | 7,510 | ​ |  | 24
GNMA | ​ |  | 572 | ​ |  | 628 | ​ |  | 56 | ​ |  | —
FNMA | ​ |  | 143,000 | ​ |  | 145,871 | ​ |  | 3,018 | ​ |  | 147
FHLMC | ​ |  | 46,699 | ​ |  | 47,326 | ​ |  | 639 | ​ |  | 12
Total mortgage-backed securities | ​ |  | 431,467 | ​ |  | 442,507 | ​ |  | 11,223 | ​ |  | 183
Total securities available for sale | ​ | $ | 679,250 | ​ | $ | 675,310 | ​ | $ | 11,460 | ​ | $ | 15,400
​ The following table summarizes the Company’s portfolio of securities available for sale at December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross
​ | ​ | Amortized | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ |  | Cost |  | Fair Value |  | Gains |  | Losses
​ | ​ | (In thousands)
Securities available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate | ​ | $ | 130,000 | ​ | $ | 123,050 | ​ | $ | — | ​ | $ | 6,950
Municipals | ​ |  | 12,797 | ​ |  | 12,916 | ​ |  | 119 | ​ |  | —
Mutual funds | ​ |  | 12,216 | ​ |  | 12,216 | ​ |  | — | ​ |  | —
Collateralized loan obligations | ​ |  | 100,349 | ​ |  | 99,137 | ​ |  | — | ​ |  | 1,212
Other | ​ |  | 1,332 | ​ |  | 1,332 | ​ |  | — | ​ |  | —
Total other securities | ​ |  | 256,694 | ​ |  | 248,651 | ​ |  | 119 | ​ |  | 8,162
REMIC and CMO | ​ |  | 348,236 | ​ |  | 348,989 | ​ |  | 2,193 | ​ |  | 1,440
GNMA | ​ |  | 653 | ​ |  | 704 | ​ |  | 51 | ​ |  | —
FNMA | ​ |  | 104,235 | ​ |  | 104,882 | ​ |  | 1,073 | ​ |  | 426
FHLMC | ​ |  | 68,476 | ​ |  | 69,274 | ​ |  | 871 | ​ |  | 73
Total mortgage-backed securities | ​ |  | 521,600 | ​ |  | 523,849 | ​ |  | 4,188 | ​ |  | 1,939
Total securities available for sale | ​ | $ | 778,294 | ​ | $ | 772,500 | ​ | $ | 4,307 | ​ | $ | 10,101
Investments Classified by Contractual Maturity Date [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized | ​ | ​ | ​
Securities held-to-maturity: |  | Cost |  | Fair Value
​ |  | (In thousands)
Due in one year or less | ​ | $ | — |  | $ | —
Due after ten years | ​ | ​ | 50,480 | ​ | ​ | 52,532
Total other securities | ​ | ​ | 50,480 | ​ | ​ | 52,532
Mortgage-backed securities | ​ | ​ | 7,924 | ​ | ​ | 9,126
Total | ​ | $ | 58,404 |  | $ | 61,658
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | ​ | ​
Securities available for sale: |  | Cost |  | Fair Value
​ | ​ | (In thousands)
Due after one year through five years | ​ | $ | 45,000 | ​ | $ | 43,154
Due after five years through ten years | ​ |  | 102,927 | ​ |  | 94,656
Due after ten years | ​ | ​ | 87,217 | ​ | ​ | 82,354
Total other securities | ​ |  | 235,144 | ​ |  | 220,164
Mutual funds | ​ |  | 12,639 | ​ |  | 12,639
Mortgage-backed securities | ​ |  | 431,467 | ​ |  | 442,507
Total | ​ | $ | 679,250 | ​ | $ | 675,310
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At June 30, 2020
​ | ​ | Total | ​ | Less than 12 months | ​ | 12 months or more
​ | ​ | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized
​ |  | Count |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
​ | ​ | (Dollars in thousands)
Held-to-maturity securities |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Municipals |  | 1 | ​ | $ | 20,464 | ​ | $ | 162 | ​ | $ | 20,464 | ​ | $ | 162 | ​ | $ | — | ​ | $ | —
Total other securities |  | 1 | ​ |  | 20,464 | ​ |  | 162 | ​ |  | 20,464 | ​ |  | 162 | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities held-to-maturity |  | 1 | ​ | $ | 20,464 | ​ | $ | 162 | ​ | $ | 20,464 | ​ | $ | 162 | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for sale securities |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate |  | 14 | ​ | $ | 110,535 | ​ | $ | 9,465 | ​ | $ | — | ​ | $ | — | ​ | $ | 110,535 | ​ | $ | 9,465
Collateralized loan obligations |  | 13 | ​ |  | 94,620 | ​ |  | 5,752 | ​ |  | 12,602 | ​ |  | 819 | ​ |  | 82,018 | ​ |  | 4,933
Total other securities |  | 27 | ​ |  | 205,155 | ​ |  | 15,217 | ​ |  | 12,602 | ​ |  | 819 | ​ |  | 192,553 | ​ |  | 14,398
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
REMIC and CMO |  | 2 | ​ |  | 7,818 | ​ |  | 24 | ​ |  | 7,818 | ​ |  | 24 | ​ |  | — | ​ |  | —
FNMA |  | 2 | ​ |  | 40,161 | ​ |  | 147 | ​ |  | 31,434 | ​ |  | 119 | ​ |  | 8,727 | ​ |  | 28
FHLMC |  | 1 | ​ |  | 14,524 | ​ |  | 12 | ​ |  | 14,524 | ​ |  | 12 | ​ |  | — | ​ |  | —
Total mortgage-backed securities |  | 5 | ​ |  | 62,503 | ​ |  | 183 | ​ |  | 53,776 | ​ |  | 155 | ​ |  | 8,727 | ​ |  | 28
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale |  | 32 | ​ | $ | 267,658 | ​ | $ | 15,400 | ​ | $ | 66,378 | ​ | $ | 974 | ​ | $ | 201,280 | ​ | $ | 14,426
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2019
​ | ​ | Total | ​ | Less than 12 months | ​ | 12 months or more
​ | ​ | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized
​ |  | Count |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
​ | ​ | (Dollars in thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for sale securities |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate |  | 16 | ​ | $ | 123,050 | ​ | $ | 6,950 | ​ | $ | — | ​ | $ | — | ​ | $ | 123,050 | ​ | $ | 6,950
Collateralized loan obligations |  | 13 | ​ |  | 99,137 | ​ |  | 1,212 | ​ |  | 25,451 | ​ |  | 108 | ​ |  | 73,686 | ​ |  | 1,104
Total other securities |  | 29 | ​ |  | 222,187 | ​ |  | 8,162 | ​ |  | 25,451 | ​ |  | 108 | ​ |  | 196,736 | ​ |  | 8,054
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
REMIC and CMO |  | 23 | ​ |  | 120,989 | ​ |  | 1,440 | ​ |  | 102,384 | ​ |  | 1,117 | ​ |  | 18,605 | ​ |  | 323
GNMA |  | 1 | ​ |  | 49 | ​ |  | — | ​ |  | 49 | ​ |  | — | ​ |  | — | ​ |  | —
FNMA |  | 8 | ​ |  | 67,618 | ​ |  | 426 | ​ |  | 19,073 | ​ |  | 138 | ​ |  | 48,545 | ​ |  | 288
FHLMC |  | 1 | ​ |  | 30,200 | ​ |  | 73 | ​ |  | — | ​ |  | — | ​ |  | 30,200 | ​ |  | 73
Total mortgage-backed securities |  | 33 | ​ |  | 218,856 | ​ |  | 1,939 | ​ |  | 121,506 | ​ |  | 1,255 | ​ |  | 97,350 | ​ |  | 684
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale |  | 62 | ​ | $ | 441,043 | ​ | $ | 10,101 | ​ | $ | 146,957 | ​ | $ | 1,363 | ​ | $ | 294,086 | ​ | $ | 8,738
Schedule of allowance for credit losses for debt securities held-to-maturity | The following table presents the activity in the allowance for credit losses for debt securities held-to-maturity for the three months ended June 30, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Mortgage-backed securities | ​ | Other securities | ​
​ | ​ | (In thousands) | ​
Beginning balance | ​ | $ | — | ​ | $ | 402 | ​
Provision | ​ | ​ | — | ​ | ​ | — | ​
Allowance for credit losses - securities | ​ | $ | — | ​ | $ | 402 | ​
​ The following table presents the activity in the allowance for credit losses for debt securities held-to-maturity for the six months ended June 30, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Mortgage-backed securities | ​ | Other securities
​ | ​ | (In thousands)
Beginning balance | ​ | $ | — | ​ | $ | —
CECL adoption | ​ | ​ | — | ​ | ​ | 340
Provision | ​ | ​ | — | ​ | ​ | 62
Allowance for credit losses - securities | ​ | $ | — | ​ | $ | 402
Schedule of Realized Gain (Loss) [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended | ​ | For the six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (In thousands)
Gross gains from the sale of securities | ​ | $ | 763 | ​ | $ | 423 | ​ | $ | 1,476 | ​ | $ | 423
Gross losses from the sale of securities | ​ |  | (817) | ​ |  | (438) | ​ |  | (1,567) | ​ |  | (438)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net losses from the sale of securities | ​ | $ | (54) | ​ | $ | (15) | ​ | $ | (91) | ​ | $ | (15)

X
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