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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) loan | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance to total loans ratio | 117.00% |  | 99.00% |
Provision for loan losses | $ 1,500,000 | $ 475,000 | $ 889,000 | $ 2,069,000
Non-accrual loans, interest income lost | 894,000 | 967,000 |  |
Loans returned to accrual, interest income | 459,000 | 1,100,000 |  |
Loans Receivable >90 Days and Accruing | 0 | 795,000 |  | 795,000
Troubled debt restructurings, amount | $ 216,102 |  | $ 1,378,000 |
Troubled debt restructurings, number | loan | 1 |  | 3 |
Financing receivables | $ 2,190,677,000 | 2,203,315,000 |  | 2,203,315,000
IA Bancorp [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Carrying value of loans acquired | 1,400,000 | 3,800,000 |  | 3,800,000
Loss [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables | 0 |  |  |
Substandard [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables | 9,900,000 |  |  |
Substandard [Member] | Impaired Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables | 9,900,000 |  |  |
Acquired loans with deteriorated credit [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for loan losses | (59,000) |  | $ (56,000) | (111,000)
Loans Receivable >90 Days and Accruing |  |  |  |
Financing receivables | $ 3,202,000 | $ 5,610,000 |  | $ 5,610,000

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- Definition Nonaccrual Loans, Interest Income, Cash Basis Method + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554 + Details
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