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Fair Value - Carrying Amount and Estimated Fair Value of Finanical Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 86,934 | $ 127,592 | $ 125,661 | $ 96,684
Financial assets |  |  |  |
Securities, carrying amount | 103,921 | 93,383 |  |
Loans receivable, net of allowance for loan losses, carrying amounts | 1,267,787 | 1,314,651 |  |
FHLBC stock, carrying amount | 8,026 | 8,290 |  |
Accrued interest receivable, carrying amount | 4,974 | 4,619 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Financial assets |  |  |  |
Securities, carrying amount | 103,921 | 93,383 |  |
Loans Receivable, Fair Value Disclosure | 1,265,906 | 1,323,139 |  |
Accounts Receivable, Fair Value Disclosure | 4,974 | 4,619 |  |
Financial liabilities |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 86,934 | 127,592 |  |
Demand Deposit Accounts Fair Value Disclosure | 225,446 | 234,354 |  |
Deposits Savings Deposits Fair Value Disclosure | 155,232 | 160,501 |  |
Now Money Market Accounts |  | 589,238 |  |
Now Money Market Accounts Fair Value Disclosure | 549,631 |  |  |
Certificates Of Deposit Fair Value Disclosure | 362,670 | 353,969 |  |
Short Term Borrowings Fair Value Disclosure | 21,214 | 60,627 |  |
Accrued Liabilities, Fair Value Disclosure | 361 | 147 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] |  |  |  |
Financial assets |  |  |  |
Loans Receivable, Fair Value Disclosure |  | 0 |  |
Accounts Receivable, Fair Value Disclosure |  | 0 |  |
Financial liabilities |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 12,473 | 13,572 |  |
Demand Deposit Accounts Fair Value Disclosure |  | 0 |  |
Deposits Savings Deposits Fair Value Disclosure |  | 0 |  |
Certificates Of Deposit Fair Value Disclosure |  | 0 |  |
Short Term Borrowings Fair Value Disclosure |  | 0 |  |
Accrued Liabilities, Fair Value Disclosure |  | 0 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] |  |  |  |
Financial assets |  |  |  |
Securities, carrying amount | 103,921 | 92,884 |  |
Loans Receivable, Fair Value Disclosure | 0 | 1,323,139 |  |
Accounts Receivable, Fair Value Disclosure | 4,974 | 4,619 |  |
Financial liabilities |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 74,461 | 114,020 |  |
Demand Deposit Accounts Fair Value Disclosure | 225,446 | 234,354 |  |
Deposits Savings Deposits Fair Value Disclosure | 155,232 | 160,501 |  |
Now Money Market Accounts |  | 589,238 |  |
Now Money Market Accounts Fair Value Disclosure | 549,631 |  |  |
Certificates of Deposit, at Carrying Value | 362,670 |  |  |
Certificates Of Deposit Fair Value Disclosure |  | 353,969 |  |
Short-term Debt | 21,214 | 60,627 |  |
Accrued Liabilities, Fair Value Disclosure | 361 | 147 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Financial assets |  |  |  |
Loans Receivable, Fair Value Disclosure | 1,265,906 | 0 |  |
Reported Value Measurement [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 86,934 | 127,592 |  |
Financial assets |  |  |  |
Securities, carrying amount | 103,921 | 93,383 |  |
Loans receivable, net of allowance for loan losses, carrying amounts | 1,267,787 | 1,314,651 |  |
FHLBC stock, carrying amount | 8,026 | 8,290 |  |
Accrued interest receivable, carrying amount | 4,974 | 4,619 |  |
Financial liabilities |  |  |  |
Demand Deposit Accounts | 225,446 | 234,354 |  |
Deposits, Savings Deposits | 155,232 | 160,501 |  |
Now Money Market Accounts |  | 589,238 |  |
Now Money Market Accounts Fair Value Disclosure | 549,631 |  |  |
Certificates of Deposit, at Carrying Value | 365,461 | 355,958 |  |
Short-term Debt | 21,232 | 60,768 |  |
Accrued Interest Payable | 361 | 147 |  |
Equity Funds [Member] |  |  |  |
Financial assets |  |  |  |
Securities, carrying amount | $ 0 | $ 499 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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