Loans Receivable, Part IV (Details) - USD ($) | 6 Months Ended | |
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | $ 1,433,803,000 | | $ 1,388,031,000 |
Loans requiring an officers' loans committee review and approval, minimum | 500,000 | | |
Minimum amount of potential loan exposure to be reviewed by credit management personnel | $ 1,000,000 | | |
Maximum period of time loan is reviewed if renewed | 1 year | | |
Period of time sales of real estate owned fair value is based | 2 years | | |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | $ 212,000 | | 224,000 |
Total Impaired, with no Reserve, Recorded Investment | 8,325,000 | | 9,833,000 |
Total Impaired, Recorded Investment | 8,537,000 | | 10,057,000 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 212,000 | | 633,000 |
Total Impaired with no Reserve, Unpaid Principal Balance | 10,159,000 | | 11,680,000 |
Total Impaired, Unpaid Principal Balance, Total | 10,371,000 | | 12,313,000 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 27,000 | | 39,000 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 27,000 | | 39,000 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 409,000 |
Total Impaired with no Reserve, Cumulative Charge-offs | 1,834,000 | | 1,847,000 |
Total Impaired, Cumulative Charge-offs | 1,834,000 | | 2,256,000 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 215,000 | $ 799,000 | |
Total Impaired with no Reserve, Average Recorded Investment | 8,436,000 | 8,099,000 | |
Total Impaired, Average Recorded Investment, Total | 8,651,000 | 8,898,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 8,000 | 32,000 | |
Total Impaired with no Reserve, Interest Paid YTD | 233,000 | 266,000 | |
Total Impaired, Interest Paid YTD | 241,000 | 298,000 | |
Charge-offs recorded to reduce the unpaid principal balance | 1,800,000 | | |
Total impaired loans including troubled debt restructurings | 3,886,000 | | 4,018,000 |
Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 9,457,000 | | 11,013,000 |
Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 18,655,000 | | 8,237,000 |
Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 1,405,691,000 | | 1,368,781,000 |
Residential Real Estate [Member] | One-to-Four Family [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 467,346,000 | | 480,280,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 212,000 | | 217,000 |
Total Impaired, with no Reserve, Recorded Investment | 7,266,000 | | 8,508,000 |
Total Impaired, Recorded Investment | 7,478,000 | | 8,725,000 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 212,000 | | 217,000 |
Total Impaired with no Reserve, Unpaid Principal Balance | 8,283,000 | | 9,531,000 |
Total Impaired, Unpaid Principal Balance, Total | 8,495,000 | | 9,748,000 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 27,000 | | 32,000 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 27,000 | | 32,000 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 1,017,000 | | 1,023,000 |
Total Impaired, Cumulative Charge-offs | 1,017,000 | | 1,023,000 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 215,000 | 353,000 | |
Total Impaired with no Reserve, Average Recorded Investment | 7,361,000 | 6,727,000 | |
Total Impaired, Average Recorded Investment, Total | 7,576,000 | 7,080,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 8,000 | 11,000 | |
Total Impaired with no Reserve, Interest Paid YTD | 189,000 | 213,000 | |
Total Impaired, Interest Paid YTD | 197,000 | 224,000 | |
Total impaired loans including troubled debt restructurings | 3,328,000 | | 3,425,000 |
Residential Real Estate [Member] | One-to-Four Family [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 7,478,000 | | 8,725,000 |
Residential Real Estate [Member] | One-to-Four Family [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 8,685,000 | | 5,975,000 |
Residential Real Estate [Member] | One-to-Four Family [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 451,183,000 | | 465,580,000 |
Residential Real Estate [Member] | Multi Family [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 598,924,000 | | 584,859,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, with no Reserve, Recorded Investment | 639,000 | | 667,000 |
Total Impaired, Recorded Investment | 639,000 | | 667,000 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired with no Reserve, Unpaid Principal Balance | 1,456,000 | | 1,491,000 |
Total Impaired, Unpaid Principal Balance, Total | 1,456,000 | | 1,491,000 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 0 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 0 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 817,000 | | 824,000 |
Total Impaired, Cumulative Charge-offs | 817,000 | | 824,000 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 348,000 | |
Total Impaired with no Reserve, Average Recorded Investment | 650,000 | 935,000 | |
Total Impaired, Average Recorded Investment, Total | 650,000 | 1,283,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 16,000 | |
Total Impaired with no Reserve, Interest Paid YTD | 34,000 | 41,000 | |
Total Impaired, Interest Paid YTD | 34,000 | 57,000 | |
Total impaired loans including troubled debt restructurings | 282,000 | | 308,000 |
Residential Real Estate [Member] | Multi Family [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 639,000 | | 668,000 |
Residential Real Estate [Member] | Multi Family [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 0 | | 0 |
Residential Real Estate [Member] | Multi Family [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 598,285,000 | | 584,191,000 |
Residential Real Estate [Member] | Home Equity [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 16,409,000 | | 18,071,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, with no Reserve, Recorded Investment | 77,000 | | 84,000 |
Total Impaired, Recorded Investment | 77,000 | | 84,000 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired with no Reserve, Unpaid Principal Balance | 77,000 | | 84,000 |
Total Impaired, Unpaid Principal Balance, Total | 77,000 | | 84,000 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 0 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 0 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired, Cumulative Charge-offs | 0 | | 0 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 85,000 | |
Total Impaired with no Reserve, Average Recorded Investment | 79,000 | 46,000 | |
Total Impaired, Average Recorded Investment, Total | 79,000 | 131,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 5,000 | |
Total Impaired with no Reserve, Interest Paid YTD | 2,000 | 2,000 | |
Total Impaired, Interest Paid YTD | 2,000 | 7,000 | |
Residential Real Estate [Member] | Home Equity [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 265,000 | | 285,000 |
Residential Real Estate [Member] | Home Equity [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 6,000 | | 3,000 |
Residential Real Estate [Member] | Home Equity [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 16,138,000 | | 17,783,000 |
Construction and Land [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 48,850,000 | | 37,033,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, with no Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, Recorded Investment | 0 | | 0 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired with no Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired, Unpaid Principal Balance, Total | 0 | | 0 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 0 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 0 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired, Cumulative Charge-offs | 0 | | 0 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 0 | |
Total Impaired with no Reserve, Average Recorded Investment | 0 | 0 | |
Total Impaired, Average Recorded Investment, Total | 0 | 0 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired with no Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired, Interest Paid YTD | 0 | 0 | |
Construction and Land [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 0 | | 0 |
Construction and Land [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 3,494,000 | | 0 |
Construction and Land [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 45,356,000 | | 37,033,000 |
Commercial Real Estate [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 244,775,000 | | 236,703,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 7,000 |
Total Impaired, with no Reserve, Recorded Investment | 343,000 | | 574,000 |
Total Impaired, Recorded Investment | 343,000 | | 581,000 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 416,000 |
Total Impaired with no Reserve, Unpaid Principal Balance | 343,000 | | 574,000 |
Total Impaired, Unpaid Principal Balance, Total | 343,000 | | 990,000 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 7,000 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 7,000 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 409,000 |
Total Impaired with no Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired, Cumulative Charge-offs | 0 | | 409,000 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 13,000 | |
Total Impaired with no Reserve, Average Recorded Investment | 346,000 | 380,000 | |
Total Impaired, Average Recorded Investment, Total | 346,000 | 393,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired with no Reserve, Interest Paid YTD | 8,000 | 9,000 | |
Total Impaired, Interest Paid YTD | 8,000 | 9,000 | |
Total impaired loans including troubled debt restructurings | 276,000 | | 285,000 |
Commercial Real Estate [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 343,000 | | 581,000 |
Commercial Real Estate [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 5,090,000 | | 1,412,000 |
Commercial Real Estate [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 239,342,000 | | 234,710,000 |
Consumer [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 860,000 | | 832,000 |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, with no Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, Recorded Investment | 0 | | 0 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired with no Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired, Unpaid Principal Balance, Total | 0 | | 0 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 0 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 0 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired, Cumulative Charge-offs | 0 | | 0 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 0 | |
Total Impaired with no Reserve, Average Recorded Investment | 0 | 0 | |
Total Impaired, Average Recorded Investment, Total | 0 | 0 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired with no Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired, Interest Paid YTD | 0 | 0 | |
Consumer [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 0 | | 0 |
Consumer [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 0 | | 0 |
Consumer [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 860,000 | | 832,000 |
Commercial Loans [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 56,639,000 | | 30,253,000 |
Minimum amount of potential loan exposure to be reviewed by credit management personnel | 200,000 | | |
Impaired Loans Receivable, Recorded Investment [Abstract] | | | |
Total Impaired, with Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, with no Reserve, Recorded Investment | 0 | | 0 |
Total Impaired, Recorded Investment | 0 | | 0 |
Impaired Loans Receivable, Unpaid Principal Balance [Abstract] | | | |
Total Impaired with Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired with no Reserve, Unpaid Principal Balance | 0 | | 0 |
Total Impaired, Unpaid Principal Balance, Total | 0 | | 0 |
Impaired Loans Receivable, Reserve [Abstract] | | | |
Total Impaired with Reserve, Reserve | 0 | | 0 |
Total Impaired with no Reserve, Reserve | 0 | | 0 |
Impaired Loans, Reserve | 0 | | 0 |
Impaired Loans Receivable, Cumulative Charge Offs [Abstract] | | | |
Total Impaired with Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired with no Reserve, Cumulative Charge-offs | 0 | | 0 |
Total Impaired, Cumulative Charge-offs | 0 | | 0 |
Impaired Loans Receivable, Average Recorded Investment [Abstract] | | | |
Total Impaired with Reserve, Average Recorded Investment | 0 | 0 | |
Total Impaired with no Reserve, Average Recorded Investment | 0 | 11,000 | |
Total Impaired, Average Recorded Investment, Total | 0 | 11,000 | |
Impaired Loans Receivable, Interest Paid YTD [Abstract] | | | |
Total Impaired with Reserve, Interest Paid YTD | 0 | 0 | |
Total Impaired with no Reserve, Interest Paid YTD | 0 | 1,000 | |
Total Impaired, Interest Paid YTD | 0 | $ 1,000 | |
Commercial Loans [Member] | Substandard [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 732,000 | | 754,000 |
Commercial Loans [Member] | Watch [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | 1,380,000 | | 847,000 |
Commercial Loans [Member] | Pass [Member] | | | |
Loans and Leases Receivable [Abstract] | | | |
At December 31, 2016 | $ 54,527,000 | | $ 28,652,000 |