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Loans and Allowance for Loan Losses (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
​ | ​ | (In thousands)
Multi-family residential | ​ | $ | 2,238,591 | ​ | $ | 2,269,048
Commercial real estate | ​ |  | 1,582,008 | ​ |  | 1,542,547
One-to-four family ― mixed-use property | ​ |  | 592,471 | ​ |  | 577,741
One-to-four family ― residential | ​ |  | 188,216 | ​ |  | 190,350
Co-operative apartments | ​ |  | 8,663 | ​ |  | 8,498
Construction | ​ |  | 67,754 | ​ |  | 50,600
Small Business Administration | ​ |  | 14,445 | ​ |  | 15,210
Taxi medallion | ​ |  | 3,309 | ​ |  | 4,539
Commercial business and other | ​ |  | 1,061,478 | ​ |  | 877,763
Gross loans | ​ |  | 5,756,935 | ​ |  | 5,536,296
Net unamortized premiums and unearned loan fees | ​ |  | 15,271 | ​ |  | 15,188
Total loans, net of fees and costs | ​ | $ | 5,772,206 | ​ | $ | 5,551,484
Schedule of Debtor Troubled Debt Restructuring, Current Period [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended | ​
​ | ​ | December 31, 2019 | ​
(Dollars in thousands) |  | Number |  | Balance |  | Modification description |
Commercial business and other |  | 3 | ​ | $ | 951 |  | Loan amortization extension. |
Total |  | 3 | ​ | $ | 951 |  |  |
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended | ​
​ | ​ | December 31, 2018 | ​
(Dollars in thousands) |  | Number |  | Balance |  | Modification description |
Commercial business and other |  | 1 | ​ | $ | 1,620 |  | Loan amortization extension. |
Total |  | 1 | ​ | $ | 1,620 |  |  |
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended | ​
​ | ​ | December 31, 2017 | ​
(Dollars in thousands) |  | Number |  | Balance |  | Modification description |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxi medallion |  | 10 | ​ | $ | 6,741 |  | Four loans received a below market interest rate and the loan amortization was extended. Six loans had loan amortization extensions. |
Total |  | 10 | ​ | $ | 6,741 |  |  |
Schedule of Financing Receivables, Non Accrual Status [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(In thousands) |  | 2019 |  | 2018
Loans ninety days or more past due and still accruing: |  | ​ |  |  | ​ |
Multi-family residential | ​ | $ | 445 | ​ | $ | —
Total | ​ |  | 445 | ​ |  | —
Non-accrual mortgage loans: | ​ |  |  | ​ |  |
Multi-family residential | ​ |  | 2,296 | ​ |  | 2,410
Commercial real estate | ​ |  | 367 | ​ |  | 1,379
One-to-four family mixed-use property | ​ |  | 274 | ​ |  | 928
One-to-four family residential | ​ |  | 5,139 | ​ |  | 6,144
Total | ​ |  | 8,076 | ​ |  | 10,861
Non-accrual non-mortgage loans: | ​ |  |  | ​ |  |
Small Business Administration | ​ |  | 1,151 | ​ |  | 1,267
Taxi medallion (1) | ​ |  | 1,641 | ​ |  | 613
Commercial business and other (1) | ​ |  | 1,945 | ​ |  | 3,512
Total | ​ |  | 4,737 | ​ |  | 5,392
Total non-accrual loans | ​ |  | 12,813 | ​ |  | 16,253
Total non-performing loans | ​ | $ | 13,258 | ​ | $ | 16,253
Schedule of Interest Foregone on Non-Accrual and TDR Loans [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
​ | ​ | (In thousands)
Interest income that would have been recognized had the loans performed in accordance with their original terms | ​ | $ | 1,546 | ​ | $ | 1,604 | ​ | $ | 1,705
Less: Interest income included in the results of operations | ​ |  | 418 | ​ |  | 623 | ​ |  | 619
Total foregone interest | ​ | $ | 1,128 | ​ | $ | 981 | ​ | $ | 1,086
Past Due Financing Receivables [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Greater | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 30 - 59 Days | ​ | 60 - 89 Days | ​ | than | ​ | Total Past | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Past Due |  | Past Due |  | 90 Days |  | Due |  | Current |  | Total Loans
Multi-family residential | ​ | $ | 4,042 | ​ | $ | 1,563 | ​ | $ | 2,741 | ​ | $ | 8,346 | ​ | $ | 2,230,245 | ​ | $ | 2,238,591
Commercial real estate | ​ |  | — | ​ |  | 4,941 | ​ |  | 367 | ​ |  | 5,308 | ​ |  | 1,576,700 | ​ |  | 1,582,008
One-to-four family - mixed-use property | ​ |  | 1,117 | ​ |  | 496 | ​ |  | 274 | ​ |  | 1,887 | ​ |  | 590,584 | ​ |  | 592,471
One-to-four family - residential | ​ |  | 720 | ​ |  | 1,022 | ​ |  | 5,139 | ​ |  | 6,881 | ​ |  | 181,335 | ​ |  | 188,216
Co-operative apartments | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,663 | ​ |  | 8,663
Construction loans | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 67,754 | ​ |  | 67,754
Small Business Administration | ​ |  | — | ​ |  | — | ​ |  | 1,151 | ​ |  | 1,151 | ​ |  | 13,294 | ​ |  | 14,445
Taxi medallion | ​ |  | — | ​ |  | — | ​ |  | 1,065 | ​ |  | 1,065 | ​ |  | 2,244 | ​ |  | 3,309
Commercial business and other | ​ |  | 2,340 | ​ |  | 5 | ​ |  | 1,945 | ​ |  | 4,290 | ​ |  | 1,057,188 | ​ |  | 1,061,478
Total | ​ | $ | 8,219 | ​ | $ | 8,027 | ​ | $ | 12,682 | ​ | $ | 28,928 | ​ | $ | 5,728,007 | ​ | $ | 5,756,935
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Greater | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 30 - 59 Days | ​ | 60 - 89 Days | ​ | than | ​ | Total Past | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Past Due |  | Past Due |  | 90 Days |  | Due |  | Current |  | Total Loans
Multi-family residential | ​ | $ | 1,887 | ​ | $ | 339 | ​ | $ | 2,410 | ​ | $ | 4,636 | ​ | $ | 2,264,412 | ​ | $ | 2,269,048
Commercial real estate | ​ |  | 379 | ​ |  | — | ​ |  | 1,379 | ​ |  | 1,758 | ​ |  | 1,540,789 | ​ |  | 1,542,547
One-to-four family - mixed-use property | ​ |  | 1,003 | ​ |  | 322 | ​ |  | 928 | ​ |  | 2,253 | ​ |  | 575,488 | ​ |  | 577,741
One-to-four family - residential | ​ |  | 1,564 | ​ |  | — | ​ |  | 6,144 | ​ |  | 7,708 | ​ |  | 182,642 | ​ |  | 190,350
Co-operative apartments | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8,498 | ​ |  | 8,498
Construction loans | ​ |  | — | ​ |  | 730 | ​ |  | — | ​ |  | 730 | ​ |  | 49,870 | ​ |  | 50,600
Small Business Administration | ​ |  | 774 | ​ |  | 68 | ​ |  | 1,267 | ​ |  | 2,109 | ​ |  | 13,101 | ​ |  | 15,210
Taxi medallion | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 4,539 | ​ |  | 4,539
Commercial business and other | ​ |  | 1,306 | ​ |  | 281 | ​ |  | 2,216 | ​ |  | 3,803 | ​ |  | 873,960 | ​ |  | 877,763
Total | ​ | $ | 6,913 | ​ | $ | 1,740 | ​ | $ | 14,344 | ​ | $ | 22,997 | ​ | $ | 5,513,299 | ​ | $ | 5,536,296
Allowance for Credit Losses on Financing Receivables [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, 2019
​ |  | ​ | ​ |  | ​ | ​ |  | One-to-four |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | family - | ​ | One-to-four | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Commercial | ​ | ​ | ​
​ | ​ | Multi-family | ​ | Commercial | ​ | mixed-use | ​ | family - | ​ | Co-operative | ​ | Construction | ​ | Small Business | ​ | Taxi | ​ | business and | ​ | ​ | ​
(in thousands) | ​ | residential | ​ | real estate | ​ | property | ​ | residential | ​ | apartments | ​ | loans | ​ | Administration | ​ | medallion | ​ | other | ​ | Total
Allowance for credit losses: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Beginning balance | ​ | $ | 5,676 | ​ | $ | 4,315 | ​ | $ | 1,867 | ​ | $ | 749 | ​ | $ | — | ​ | $ | 329 | ​ | $ | 418 | ​ | $ | — | ​ | $ | 7,591 | ​ | $ | 20,945
Charge-off's | ​ |  | (190) | ​ |  | — | ​ |  | (89) | ​ |  | (113) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (2,386) | ​ |  | (2,778)
Recoveries | ​ |  | 44 | ​ |  | 37 | ​ |  | 197 | ​ |  | 13 | ​ |  | — | ​ |  | — | ​ |  | 60 | ​ |  | 134 | ​ |  | 288 | ​ |  | 773
Provision (benefit) | ​ |  | (139) | ​ |  | 77 | ​ |  | (158) | ​ |  | 107 | ​ |  | — | ​ |  | 112 | ​ |  | (115) | ​ |  | (134) | ​ |  | 3,061 | ​ |  | 2,811
Ending balance | ​ | $ | 5,391 | ​ | $ | 4,429 | ​ | $ | 1,817 | ​ | $ | 756 | ​ | $ | — | ​ | $ | 441 | ​ | $ | 363 | ​ | $ | — | ​ | $ | 8,554 | ​ | $ | 21,751
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, 2018
​ |  | ​ | ​ |  | ​ | ​ |  | One-to-four |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | family - | ​ | One-to-four | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Commercial | ​ | ​ | ​
​ | ​ | Multi-family | ​ | Commercial | ​ | mixed-use | ​ | family - | ​ | Co-operative | ​ | Construction | ​ | Small Business | ​ | Taxi | ​ | business and | ​ | ​ | ​
(in thousands) | ​ | residential | ​ | real estate | ​ | property | ​ | residential | ​ | apartments | ​ | loans | ​ | Administration | ​ | medallion | ​ | other | ​ | Total
Allowance for credit losses: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Beginning balance | ​ | $ | 5,823 | ​ | $ | 4,643 | ​ | $ | 2,545 | ​ | $ | 1,082 | ​ | $ | — | ​ | $ | 68 | ​ | $ | 669 | ​ | $ | — | ​ | $ | 5,521 | ​ | $ | 20,351
Charge-off's | ​ |  | (99) | ​ |  | — | ​ |  | (3) | ​ |  | (1) | ​ |  | — | ​ |  | — | ​ |  | (392) | ​ |  | (393) | ​ |  | (44) | ​ |  | (932)
Recoveries | ​ |  | 6 | ​ |  | — | ​ |  | 136 | ​ |  | 569 | ​ |  | — | ​ |  | — | ​ |  | 51 | ​ |  | 143 | ​ |  | 46 | ​ |  | 951
Provision (benefit) | ​ |  | (54) | ​ |  | (328) | ​ |  | (811) | ​ |  | (901) | ​ |  | — | ​ |  | 261 | ​ |  | 90 | ​ |  | 250 | ​ |  | 2,068 | ​ |  | 575
Ending balance | ​ | $ | 5,676 | ​ | $ | 4,315 | ​ | $ | 1,867 | ​ | $ | 749 | ​ | $ | — | ​ | $ | 329 | ​ | $ | 418 | ​ | $ | — | ​ | $ | 7,591 | ​ | $ | 20,945
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, 2017
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | One-to-four | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | family - |  | One-to-four |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Commercial |  | ​ | ​ |  | ​ | ​
​ | ​ | Multi-family | ​ | Commercial | ​ | mixed-use | ​ | family - | ​ | Co-operative | ​ | Construction | ​ | Small Business | ​ | medallion | ​ | business and | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | residential | ​ | real estate | ​ | property | ​ | residential | ​ | apartments | ​ | loans | ​ | Administration | ​ | Taxi | ​ | other | ​ | Unallocated | ​ | Total
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 5,923 | ​ | $ | 4,487 | ​ | $ | 2,903 | ​ | $ | 1,015 | ​ | $ | — | ​ | $ | 92 | ​ | $ | 481 | ​ | $ | 2,243 | ​ | $ | 4,492 | ​ | $ | 593 | ​ | $ | 22,229
Charge-off's | ​ |  | (454) | ​ |  | (4) | ​ |  | (39) | ​ |  | (415) | ​ |  | — | ​ |  | — | ​ |  | (212) | ​ |  | (11,283) | ​ |  | (65) | ​ |  | — | ​ |  | (12,472)
Recoveries | ​ |  | 300 | ​ |  | 96 | ​ |  | 108 | ​ |  | 91 | ​ |  | — | ​ |  | — | ​ |  | 80 | ​ |  | — | ​ |  | 58 | ​ |  | — | ​ |  | 733
Provision (benefit) | ​ |  | 54 | ​ |  | 64 | ​ |  | (427) | ​ |  | 391 | ​ |  | — | ​ |  | (24) | ​ |  | 320 | ​ |  | 9,040 | ​ |  | 1,036 | ​ |  | (593) | ​ |  | 9,861
Ending balance | ​ | $ | 5,823 | ​ | $ | 4,643 | ​ | $ | 2,545 | ​ | $ | 1,082 | ​ | $ | — | ​ | $ | 68 | ​ | $ | 669 | ​ | $ | — | ​ | $ | 5,521 | ​ | $ | — | ​ | $ | 20,351
Schedule of Loans and the Manner in which they are Evaluated for Impairment [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | One-to-four | ​ | One-to-four | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Commercial | ​ | ​ | ​
​ | ​ | Multi-family | ​ | Commercial | ​ | family - mixed - | ​ | family - | ​ | Co-operative | ​ | Construction | ​ | Small Business | ​ | ​ | ​ | business and | ​ | ​ | ​
(in thousands) | ​ | residential | ​ | real estate | ​ | use property | ​ | residential | ​ | apartments | ​ | loans | ​ | Administration | ​ | Taxi medallion | ​ | other | ​ | Total
Financing Receivables: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Ending Balance | ​ | $ | 2,238,591 | ​ | $ | 1,582,008 | ​ | $ | 592,471 | ​ | $ | 188,216 | ​ | $ | 8,663 | ​ | $ | 67,754 | ​ | $ | 14,445 | ​ | $ | 3,309 | ​ | $ | 1,061,478 | ​ | $ | 5,756,935
Ending balance: individually evaluated for impairment | ​ | $ | 4,169 | ​ | $ | 367 | ​ | $ | 1,761 | ​ | $ | 5,941 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,151 | ​ | $ | 3,309 | ​ | $ | 2,886 | ​ | $ | 19,584
Ending balance: collectively evaluated for impairment | ​ | $ | 2,234,422 | ​ | $ | 1,581,641 | ​ | $ | 590,710 | ​ | $ | 182,275 | ​ | $ | 8,663 | ​ | $ | 67,754 | ​ | $ | 13,294 | ​ | $ | — | ​ | $ | 1,058,592 | ​ | $ | 5,737,351
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Ending balance: individually evaluated for impairment | ​ | $ | 92 | ​ | $ | — | ​ | $ | 45 | ​ | $ | 46 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 132 | ​ | $ | 315
Ending balance: collectively evaluated for impairment | ​ | $ | 5,299 | ​ | $ | 4,429 | ​ | $ | 1,772 | ​ | $ | 710 | ​ | $ | — | ​ | $ | 441 | ​ | $ | 363 | ​ | $ | — | ​ | $ | 8,422 | ​ | $ | 21,436
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2018
​ |  | ​ | ​ |  | ​ | ​ |  | One-to-four |  | One-to-four | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ |  | Commercial |  | ​ | ​
​ | ​ | Multi-family | ​ | Commercial | ​ | family - mixed | ​ | family - | ​ | ​ | Co-operative | ​ | Construction | ​ | ​ | Small Business | ​ | ​ | ​ | business and | ​ | ​ | ​
(in thousands) | ​ | residential | ​ | real estate | ​ | use property | ​ | residential | ​ | ​ | apartments | ​ | loans | ​ | ​ | Administration | ​ | Taxi medallion | ​ | other | ​ | Total
Financing Receivables: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Ending Balance | ​ | $ | 2,269,048 | ​ | $ | 1,542,547 | ​ | $ | 577,741 | ​ | $ | 190,350 | ​ | $ | 8,498 | ​ | $ | 50,600 | ​ | $ | 15,210 | ​ | $ | 4,539 | ​ | $ | 877,763 | ​ | $ | 5,536,296
Ending balance: individually evaluated for impairment | ​ | $ | 4,500 | ​ | $ | 1,435 | ​ | $ | 3,098 | ​ | $ | 6,889 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,267 | ​ | $ | 4,539 | ​ | $ | 3,791 | ​ | $ | 25,519
Ending balance: collectively evaluated for impairment | ​ | $ | 2,264,548 | ​ | $ | 1,541,112 | ​ | $ | 574,643 | ​ | $ | 183,461 | ​ | $ | 8,498 | ​ | $ | 50,600 | ​ | $ | 13,943 | ​ | $ | — | ​ | $ | 873,972 | ​ | $ | 5,510,777
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Ending balance: individually evaluated for impairment | ​ | $ | 100 | ​ | $ | — | ​ | $ | 143 | ​ | $ | 51 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 866 | ​ | $ | 1,160
Ending balance: collectively evaluated for impairment | ​ | $ | 5,576 | ​ | $ | 4,315 | ​ | $ | 1,724 | ​ | $ | 698 | ​ | $ | — | ​ | $ | 329 | ​ | $ | 418 | ​ | $ | — | ​ | $ | 6,725 | ​ | $ | 19,785
Impaired Financing Receivables [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ | ​ | ​ | ​ | ​ | Unpaid | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unpaid | ​ | ​ | ​
​ | ​ | Recorded | ​ | Principal | ​ | Related | ​ | Recorded | ​ | Principal | ​ | Related
​ |  | Investment |  | Balance |  | Allowance |  | Investment |  | Balance |  | Allowance
​ | ​ | (In thousands)
With no related allowance recorded: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage loans: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Multi-family residential | ​ | $ | 2,919 | ​ | $ | 2,919 | ​ | $ | — | ​ | $ | 3,225 | ​ | $ | 3,568 | ​ | $ | —
Commercial real estate | ​ |  | 367 | ​ |  | 367 | ​ |  | — | ​ |  | 1,435 | ​ |  | 1,435 | ​ |  | —
One-to-four family mixed-use property | ​ |  | 921 | ​ |  | 924 | ​ |  | — | ​ |  | 1,913 | ​ |  | 2,113 | ​ |  | —
One-to-four family residential | ​ |  | 5,558 | ​ |  | 5,615 | ​ |  | — | ​ |  | 6,490 | ​ |  | 6,643 | ​ |  | —
Non-mortgage loans: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |
Small Business Administration | ​ |  | 1,151 | ​ |  | 1,421 | ​ |  | — | ​ |  | 1,267 | ​ |  | 1,609 | ​ |  | —
Taxi medallion | ​ |  | 3,309 | ​ |  | 9,527 | ​ |  | — | ​ |  | 4,539 | ​ |  | 12,788 | ​ |  | —
Commercial business and other | ​ |  | 1,945 | ​ |  | 1,945 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total loans with no related allowance recorded | ​ |  | 16,170 | ​ |  | 22,718 | ​ |  | — | ​ |  | 18,869 | ​ |  | 28,156 | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
With an allowance recorded: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage loans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Multi-family residential | ​ |  | 1,250 | ​ |  | 1,250 | ​ |  | 92 | ​ |  | 1,275 | ​ |  | 1,275 | ​ |  | 100
One-to-four family mixed-use property | ​ |  | 840 | ​ |  | 840 | ​ |  | 45 | ​ |  | 1,185 | ​ |  | 1,185 | ​ |  | 143
One-to-four family residential | ​ |  | 383 | ​ |  | 383 | ​ |  | 46 | ​ |  | 399 | ​ |  | 399 | ​ |  | 51
Commercial business and other | ​ |  | 941 | ​ |  | 941 | ​ |  | 132 | ​ |  | 3,791 | ​ |  | 3,791 | ​ |  | 866
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total loans with an allowance recorded | ​ |  | 3,414 | ​ |  | 3,414 | ​ |  | 315 | ​ |  | 6,650 | ​ |  | 6,650 | ​ |  | 1,160
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Impaired Loans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Total mortgage loans | ​ | $ | 12,238 | ​ | $ | 12,298 | ​ | $ | 183 | ​ | $ | 15,922 | ​ | $ | 16,618 | ​ | $ | 294
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total non-mortgage loans | ​ | $ | 7,346 | ​ | $ | 13,834 | ​ | $ | 132 | ​ | $ | 9,597 | ​ | $ | 18,188 | ​ | $ | 866
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018 | ​ | December 31, 2017
​ | ​ | Average | ​ | Interest | ​ | Average | ​ | Interest | ​ | Average | ​ | Interest
​ | ​ | Recorded | ​ | Income | ​ | Recorded | ​ | Income | ​ | Recorded | ​ | Income
​ |  | Investment |  | Recognized |  | Investment |  | Recognized |  | Investment |  | Recognized
​ | ​ | (In thousands)
With no related allowance recorded: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Multi-family residential | ​ | $ | 3,155 | ​ | $ | 36 | ​ | $ | 3,957 | ​ | $ | 76 | ​ | $ | 3,260 |  | $ | 80
Commercial real estate | ​ |  | 1,081 | ​ |  | 15 | ​ |  | 4,334 | ​ |  | 176 | ​ |  | 6,187 |  | ​ | 300
One-to-four family mixed-use property | ​ |  | 1,719 | ​ |  | 67 | ​ |  | 3,298 | ​ |  | 125 | ​ |  | 5,104 |  | ​ | 168
One-to-four family residential | ​ |  | 5,866 | ​ |  | 7 | ​ |  | 7,603 | ​ |  | 33 | ​ |  | 9,865 |  | ​ | 108
Construction | ​ |  | 190 | ​ |  | — | ​ |  | 183 | ​ |  | 10 | ​ |  | 596 |  | ​ | 22
Non-mortgage loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Small Business Administration | ​ |  | 1,204 | ​ |  | — | ​ |  | 711 | ​ |  | 33 | ​ |  | 207 |  | ​ | 11
Taxi medallion | ​ |  | 3,761 | ​ |  | 171 | ​ |  | 5,865 | ​ |  | 313 | ​ |  | 4,537 |  | ​ | 161
Commercial business and other | ​ |  | 1,398 | ​ |  | — | ​ |  | 10,170 | ​ |  | 792 | ​ |  | 1,267 |  | ​ | 98
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total loans with no related allowance recorded | ​ |  | 18,374 | ​ |  | 296 | ​ |  | 36,121 | ​ |  | 1,558 | ​ |  | 31,023 |  | ​ | 948
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
With an allowance recorded: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​ |
Mortgage loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Multi-family residential | ​ |  | 1,263 | ​ |  | 72 | ​ |  | 1,741 | ​ |  | 96 | ​ |  | 2,348 |  | ​ | 136
Commercial real estate | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2,026 |  | ​ | 95
One-to-four family mixed-use property | ​ |  | 975 | ​ |  | 34 | ​ |  | 1,201 | ​ |  | 54 | ​ |  | 1,341 |  | ​ | 65
One-to-four family residential | ​ |  | 391 | ​ |  | 16 | ​ |  | 405 | ​ |  | 16 | ​ |  | 420 |  | ​ | 16
Non-mortgage loans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxi medallion | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 10,997 |  | ​ | 166
Commercial business and other | ​ |  | 1,446 | ​ |  | — | ​ |  | 1,178 | ​ |  | 25 | ​ |  | 375 |  | ​ | 22
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total loans with an allowance recorded | ​ |  | 4,075 | ​ |  | 122 | ​ |  | 4,525 | ​ |  | 191 | ​ |  | 17,507 |  | ​ | 500
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Impaired Loans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​ |
Total mortgage loans | ​ | $ | 14,640 | ​ | $ | 247 | ​ | $ | 22,722 | ​ | $ | 586 | ​ | $ | 31,147 |  | $ | 990
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total non-mortgage loans | ​ | $ | 7,809 | ​ | $ | 171 | ​ | $ | 17,924 | ​ | $ | 1,163 | ​ | $ | 17,383 |  | $ | 458
Financing Receivable Credit Quality Indicators [Table Text Block] | The following table sets forth the recorded investment in loans designated as Criticized or Classified at December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands) |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
Multi-family residential | ​ | $ | 1,563 | ​ | $ | 2,743 | ​ | $ | — | ​ | $ | — | ​ | $ | 4,306
Commercial real estate | ​ |  | 5,525 | ​ |  | 367 | ​ |  | — | ​ |  | — | ​ |  | 5,892
One-to-four family - mixed-use property | ​ |  | 1,585 | ​ |  | 453 | ​ |  | — | ​ |  | — | ​ |  | 2,038
One-to-four family - residential | ​ |  | 1,095 | ​ |  | 5,787 | ​ |  | — | ​ |  | — | ​ |  | 6,882
Small Business Administration (1) | ​ |  | 55 | ​ |  | 85 | ​ |  | — | ​ |  | — | ​ |  | 140
Taxi medallion | ​ |  | — | ​ |  | 3,309 | ​ |  | — | ​ |  | — | ​ |  | 3,309
Commercial business and other | ​ |  | 3,924 | ​ |  | 11,289 | ​ |  | 266 | ​ |  | — | ​ |  | 15,479
Total loans | ​ | $ | 13,747 | ​ | $ | 24,033 | ​ | $ | 266 | ​ | $ | — | ​ | $ | 38,046
​ The following table sets forth the recorded investment in loans designated as Criticized or Classified at December 31, 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands) |  | Special Mention |  | Substandard |  | Doubtful |  | Loss |  | Total
Multi-family residential | ​ | $ | 2,498 | ​ | $ | 4,166 | ​ | $ | — | ​ | $ | — | ​ | $ | 6,664
Commercial real estate | ​ |  | 381 | ​ |  | 4,051 | ​ |  | — | ​ |  | — | ​ |  | 4,432
One-to-four family - mixed-use property | ​ |  | 1,199 | ​ |  | 2,034 | ​ |  | — | ​ |  | — | ​ |  | 3,233
One-to-four family - residential | ​ |  | 557 | ​ |  | 6,665 | ​ |  | — | ​ |  | — | ​ |  | 7,222
Construction loans | ​ |  | 730 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 730
Small Business Administration (1) | ​ |  | 481 | ​ |  | 139 | ​ |  | — | ​ |  | — | ​ |  | 620
Taxi medallion | ​ |  | — | ​ |  | 4,539 | ​ |  | — | ​ |  | — | ​ |  | 4,539
Commercial business and other | ​ |  | 730 | ​ |  | 21,348 | ​ |  | 3,512 | ​ |  | — | ​ |  | 25,590
Total loans | ​ | $ | 6,576 | ​ | $ | 42,942 | ​ | $ | 3,512 | ​ | $ | — | ​ | $ | 53,030
(1) | Balance reported net of SBA Guaranteed portion.
Nonperforming Financial Instruments [Member] |
Notes Tables |
Troubled Debt Restructurings on Financing Receivables [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ | ​ | Number | ​ | Recorded | ​ | Number | ​ | Recorded
(Dollars in thousands) |  | of contracts |  | investment |  | of contracts |  | investment
Multi-family residential |  | — | ​ | $ | — |  | 1 | ​ | $ | 388
Taxi medallion |  | 4 | ​ |  | 1,065 |  | — | ​ |  | —
Commercial business and other |  | 1 | ​ |  | 279 |  | 1 | ​ |  | 1,397
Total TDR's that subsequently defaulted |  | 5 | ​ | $ | 1,344 |  | 2 | ​ | $ | 1,785
Performing According to Restructured Terms [Member] |
Notes Tables |
Troubled Debt Restructurings on Financing Receivables [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ | ​ | Number | ​ | Recorded | ​ | Number | ​ | Recorded
(Dollars in thousands) |  | of contracts |  | investment |  | of contracts |  | investment
Multi-family residential |  | 7 | ​ | $ | 1,873 |  | 7 | ​ | $ | 1,916
One-to-four family - mixed-use property |  | 4 | ​ |  | 1,481 |  | 5 | ​ |  | 1,692
One-to-four family - residential |  | 3 | ​ |  | 531 |  | 3 | ​ |  | 552
Taxi medallion |  | 7 | ​ |  | 1,668 |  | 15 | ​ |  | 3,926
Commercial business and other |  | 3 | ​ |  | 941 |  | 1 | ​ |  | 279
Total performing |  | 24 | ​ | $ | 6,494 |  | 31 | ​ | $ | 8,365

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