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Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Notes Tables |
Fair Value Option, Disclosures [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value | ​ | Fair Value | ​ | Changes in Fair Values For Items Measured at Fair Value
​ | ​ | Measurements | ​ | Measurements | ​ | Pursuant to Election of the Fair Value Option
​ |  | at December 31, |  | at December 31, |  | For the year ended December 31,
Description |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2017
(Dollars in thousands) |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities | ​ | $ | 772 | ​ | $ | 967 | ​ | $ | 3 | ​ | $ | (19) | ​ | $ | (26)
Other securities | ​ |  | 13,548 | ​ |  | 12,843 | ​ |  | 427 | ​ |  | (109) | ​ |  | 134
Borrowed funds | ​ |  | 44,384 | ​ |  | 41,849 | ​ |  | (2,802) | ​ |  | (4,913) | ​ |  | (2,993)
Net loss from fair value adjustments (1) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | (2,372) | ​ | $ | (5,041) | ​ | $ | (2,885)
(1) | The net loss from fair value adjustments presented in the above table does not include net gains (losses) of ($3.0) million, $0.9 million and ($0.6) million from the change in fair value of derivative instruments during the years ended December 31, 2019, 2018 and 2017, respectively.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quoted Prices | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | in Active Markets | ​ | Significant Other | ​ | Significant Other | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | for Identical Assets | ​ | Observable Inputs | ​ | Unobservable Inputs | ​ | Total carried at fair value
​ | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | on a recurring basis
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
​ |  | (In thousands)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities | ​ | $ | — | ​ | $ | — | ​ | $ | 523,849 | ​ | $ | 557,953 | ​ | $ | — | ​ | $ | — | ​ | $ | 523,849 | ​ | $ | 557,953
Other securities | ​ |  | 12,216 | ​ |  | 11,586 | ​ |  | 235,103 | ​ |  | 251,860 | ​ |  | 1,332 | ​ |  | 1,256 | ​ |  | 248,651 | ​ |  | 264,702
Interest rate swaps | ​ |  | — | ​ |  | — | ​ |  | 2,352 | ​ |  | 15,961 | ​ |  | — | ​ |  | — | ​ |  | 2,352 | ​ |  | 15,961
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets | ​ | $ | 12,216 | ​ | $ | 11,586 | ​ | $ | 761,304 | ​ | $ | 825,774 | ​ | $ | 1,332 | ​ | $ | 1,256 | ​ | $ | 774,852 | ​ | $ | 838,616
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Borrowings | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 44,384 | ​ | $ | 41,849 | ​ | $ | 44,384 | ​ | $ | 41,849
Interest rate swaps | ​ |  | — | ​ |  | — | ​ |  | 19,653 | ​ |  | 2,239 | ​ |  | — | ​ |  | — | ​ |  | 19,653 | ​ |  | 2,239
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 19,653 | ​ | $ | 2,239 | ​ | $ | 44,384 | ​ | $ | 41,849 | ​ | $ | 64,037 | ​ | $ | 44,088
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the year ended
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ | ​ | Trust preferred | ​ | Junior subordinated | ​ | Trust preferred | ​ | Junior subordinated
​ |  | securities |  | debentures |  | securities |  | debentures
​ |  | (In thousands)
Beginning balance | ​ | $ | 1,256 | ​ | $ | 41,849 | ​ | $ | 1,110 | ​ | $ | 36,986
Net gain from fair value adjustment of financial assets (1) | ​ |  | 78 | ​ |  | — | ​ |  | 145 | ​ |  | —
Net loss from fair value adjustment of financial liabilities (1) | ​ |  | — | ​ |  | 2,803 | ​ |  | — | ​ |  | 4,913
Increase(Decrease) in accrued interest | ​ |  | (2) | ​ |  | (39) | ​ |  | 1 | ​ |  | 66
Change in unrealized losses included in other comprehensive loss | ​ |  | — | ​ |  | (229) | ​ |  | — | ​ |  | (116)
Ending balance | ​ | $ | 1,332 | ​ | $ | 44,384 | ​ | $ | 1,256 | ​ | $ | 41,849
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Changes in unrealized gains held at period end | ​ | $ | — | ​ | $ | 1,476 | ​ | $ | — | ​ | $ | —
(1) | These totals in the table above are presented in the Consolidated Statement of Income under net loss from fair value adjustments.
Fair Value Measurements, Nonrecurring [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quoted Prices |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | in Active Markets | ​ | Significant Other | ​ | Significant Other | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | for Identical Assets | ​ | Observable Inputs | ​ | Unobservable Inputs | ​ | Total carried at fair value
​ | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | on a non-recurring basis
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
​ |  | (In thousands)
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Impaired loans | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 1,081 | ​ | $ | 4,111 | ​ | $ | 1,081 | ​ | $ | 4,111
Other repossessed assets | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 239 | ​ |  | 35 | ​ |  | 239 | ​ |  | 35
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 1,320 | ​ | $ | 4,146 | ​ | $ | 1,320 | ​ | $ | 4,146
Fair Value, by Balance Sheet Grouping [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2019
​ | ​ | Carrying | ​ | Fair | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amount |  | Value |  | Level 1 |  | Level 2 |  | Level 3
​ |  | (In thousands)
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and due from banks | ​ | $ | 49,787 | ​ | $ | 49,787 | ​ | $ | 49,787 | ​ | $ | — | ​ | $ | —
Securities held-to-maturity | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities | ​ |  | 7,934 | ​ |  | 8,114 | ​ |  | — | ​ |  | 8,114 | ​ |  | —
Other securities | ​ |  | 50,954 | ​ |  | 53,998 | ​ |  | — | ​ |  | — | ​ |  | 53,998
Securities available for sale | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities | ​ |  | 523,849 | ​ |  | 523,849 | ​ |  | — | ​ |  | 523,849 | ​ |  | —
Other securities | ​ |  | 248,651 | ​ |  | 248,651 | ​ |  | 12,216 | ​ |  | 235,103 | ​ |  | 1,332
Loans | ​ |  | 5,772,206 | ​ |  | 5,822,124 | ​ |  | — | ​ |  | — | ​ |  | 5,822,124
FHLB-NY stock | ​ |  | 56,921 | ​ |  | 56,921 | ​ |  | — | ​ |  | 56,921 | ​ |  | —
Accrued interest receivable | ​ |  | 25,722 | ​ |  | 25,722 | ​ |  | 9 | ​ |  | 2,519 | ​ |  | 23,194
Interest rate swaps | ​ |  | 2,352 | ​ |  | 2,352 | ​ |  | — | ​ |  | 2,352 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 5,066,424 | ​ | $ | 5,070,046 | ​ | $ | 3,628,534 | ​ | $ | 1,441,512 | ​ | $ | —
Borrowings | ​ |  | 1,237,231 | ​ |  | 1,389,883 | ​ |  | — | ​ |  | 1,345,499 | ​ |  | 44,384
Accrued interest payable | ​ |  | 6,752 | ​ |  | 6,752 | ​ |  | — | ​ |  | 6,752 | ​ |  | —
Interest rate swaps | ​ |  | 19,653 | ​ |  | 19,653 | ​ |  | — | ​ |  | 19,653 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2018
​ | ​ | Carrying | ​ | Fair | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amount |  | Value |  | Level 1 |  | Level 2 |  | Level 3
​ | ​ | (In thousands)
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and due from banks | ​ | $ | 118,561 | ​ | $ | 118,561 | ​ | $ | 118,561 | ​ | $ | — | ​ | $ | —
Securities held-to-maturity | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities | ​ |  | 7,953 | ​ |  | 7,366 | ​ |  | — | ​ |  | 7,366 | ​ |  | —
Other securities | ​ |  | 24,065 | ​ |  | 22,508 | ​ |  | — | ​ |  | — | ​ |  | 22,508
Securities available for sale | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities | ​ |  | 557,953 | ​ |  | 557,953 | ​ |  | — | ​ |  | 557,953 | ​ |  | —
Other securities | ​ |  | 264,702 | ​ |  | 264,702 | ​ |  | 11,586 | ​ |  | 251,860 | ​ |  | 1,256
Loans | ​ |  | 5,551,484 | ​ |  | 5,496,266 | ​ |  | — | ​ |  | — | ​ |  | 5,496,266
FHLB-NY stock | ​ |  | 57,282 | ​ |  | 57,282 | ​ |  | — | ​ |  | 57,282 | ​ |  | —
Accrued interest receivable | ​ |  | 25,485 | ​ |  | 25,485 | ​ |  | 54 | ​ |  | 2,756 | ​ |  | 22,675
Interest rate swaps | ​ |  | 15,961 | ​ |  | 15,961 | ​ |  | — | ​ |  | 15,961 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Deposits | ​ | $ | 4,960,784 | ​ | $ | 4,955,077 | ​ | $ | 3,397,474 | ​ | $ | 1,557,603 | ​ | $ | —
Borrowings | ​ |  | 1,250,843 | ​ |  | 1,241,745 | ​ |  | — | ​ |  | 1,199,896 | ​ |  | 41,849
Accrued interest payable | ​ |  | 5,890 | ​ |  | 5,890 | ​ |  | — | ​ |  | 5,890 | ​ |  | —
Interest rate swaps | ​ |  | 2,239 | ​ |  | 2,239 | ​ |  | — | ​ |  | 2,239 | ​ |  | —
Fair Value, Measurements, Nonrecurring [Member] |
Notes Tables |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2019 |
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average |
​ | ​ | (Dollars in thousands) |
Assets: |  | ​ |  |  |  |  |  |  |  |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 809 |  | Discounted Cashflow |  | Discount Rate |  | 6.43 | % | 6.43 | %
​ | ​ |  | ​ |  | ​ | ​ | Probability of Default | ​ | 20.0 | % | 20.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 272 |  | Blended income and sales approach |  | Adjustment to sales comparison value to reconcile differences between comparable sales |  | -10.0% to 15.0% | % | 2.5 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | Capitalization rate | ​ | 9.5 | % | 9.5 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | Reduction for planned expedited disposal | ​ | 15.0 | % | 15.0 | %
​ | ​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other repossessed assets | ​ | $ | 239 |  | Sales approach |  | Reduction for planned expedited disposal |  | 0.5% to 12.5% | % | 6.5 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2018 |
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average |
​ | ​ | (Dollars in thousands) |
Assets: |  | ​ |  |  |  |  |  |  |  |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 204 |  | Income approach |  | Capitalization rate |  | 8.5 | % | 8.5 | %
​ | ​ |  | ​ |  | ​ | ​ | Reduction for planned expedited disposal | ​ | 15.0 | % | 15.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 2,724 |  | Sales approach |  | Adjustment to sales comparison value to |  | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | reconcile differences between comparable | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | sales | ​ | — | % | — | %
​ | ​ |  | ​ | ​ | ​ | ​ | Reduction for planned expedited disposal |  | -36.5% to 15.0 | % | 10.4 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Impaired loans | ​ | $ | 1,183 |  | Blended income and sales approach |  | Adjustment to sales comparison value to reconcile differences between comparable sales |  | -30.0% to 10.0 | % | (7.8) | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | Capitalization rate | ​ | 7.4% to 9.8 | % | 8.7 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | Reduction for planned expedited disposal | ​ | 15.0 | % | 15.0 | %
​ | ​ |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other repossessed assets | ​ | $ | 35 |  | Sales approach |  | Reduction for planned expedited disposal |  | — | % | — | %
Fair Value, Measurements, Recurring [Member] |
Notes Tables |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 |
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average | ​
​ |  | ​ | (Dollars in thousands) | ​
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trust preferred securities | ​ | $ | 1,332 |  | Discounted cash flows |  | Discount rate |  | n/a |  | 4.2 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ |  |  |  |  |  |  |  |  |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Junior subordinated debentures | ​ | $ | 44,384 |  | Discounted cash flows |  | Discount rate |  | n/a |  | 4.2 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2018 |
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average |
​ |  | (Dollars in thousands) | ​
Assets: |  | ​ |  |  |  |  |  |  |  |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trust preferred securities | ​ | $ | 1,256 |  | Discounted cash flows |  | Discount rate |  | n/a |  | 4.9 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ |  |  |  |  |  |  |  |  |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Junior subordinated debentures | ​ | $ | 41,849 |  | Discounted cash flows |  | Discount rate |  | n/a |  | 4.9 | %

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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