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Fair Value - Carrying values and related estimated fair values of financial instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financial assets, Carrying value: |  |
Cash and cash equivalents - Carrying Value | $ 61,172 | $ 17,139
Certificates of deposit in other financial institutions -Carrying Value | 1,970 | 2,024
Securities available-for-sale - Carrying Value | 258,742 | 241,768
Loans held-for-sale - Carrying Value | 3,835 | 2,863
Loans receivable, net - Carrying Value | 885,530 | 756,438
Federal Home Loan Bank stock - Carrying Value | 3,912 | 3,460
Accrued interest receivable - Carrying Value | 4,131 | 3,632
Financial liabilities, Carrying value: |  |
Non-interest bearing deposits - Carrying Value | 178,394 | 127,277
Interest bearing deposits - Carrying Value | 948,727 | 802,509
Repurchase agreements - Carrying Value | 20,628 | 11,628
Borrowed funds - Carrying Value | 18,000 | 43,000
Accrued interest payable - Carrying Value | 166 | 186
Financial assets, Fair value: |  |
Cash and cash equivalents - Estimated Fair Value | 61,172 | 17,139
Certificates of deposit in other financial institutions - Estimated Fair Value | 1,940 | 2,001
Securities available-for-sale - Estimated Fair Value | 258,742 | 241,768
Loans held-for-sale - Estimated Fair Value | 3,920 | 2,910
Loans receivable, net - Estimated Fair Value | 891,109 | 747,553
Federal Home Loan Bank stock - Estimated Fair Value | 3,912 | 3,460
Accrued interest receivable - Estimated Fair Value | 4,131 | 3,632
Financial liabilities, Fair value: |  |
Non-interest bearing deposits - Estimated Fair Value | 178,394 | 127,277
Interest bearing deposits - Estimated Fair Value | 947,957 | 800,349
Repurchase agreements - Estimated Fair Value | 20,628 | 11,626
Borrowed funds - Estimated Fair Value | 18,081 | 42,888
Accrued interest payable - Estimated Fair Value | 166 | 186
Fair Value, Inputs, Level 1 [Member] |  |
Financial assets, Fair value: |  |
Cash and cash equivalents - Estimated Fair Value | 61,172 | 17,139
Certificates of deposit in other financial institutions - Estimated Fair Value | 0 |
Securities available-for-sale - Estimated Fair Value | 5,598 | 2,480
Loans held-for-sale - Estimated Fair Value | 3,920 | 2,910
Loans receivable, net - Estimated Fair Value | 0 |
Federal Home Loan Bank stock - Estimated Fair Value | 0 |
Accrued interest receivable - Estimated Fair Value | 0 |
Financial liabilities, Fair value: |  |
Non-interest bearing deposits - Estimated Fair Value | 178,394 | 127,277
Interest bearing deposits - Estimated Fair Value | 631,162 | 543,617
Repurchase agreements - Estimated Fair Value | 18,863 | 9,867
Borrowed funds - Estimated Fair Value | 0 |
Accrued interest payable - Estimated Fair Value | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Financial assets, Fair value: |  |
Cash and cash equivalents - Estimated Fair Value | 0 |
Certificates of deposit in other financial institutions - Estimated Fair Value | 1,940 | 2,001
Securities available-for-sale - Estimated Fair Value | 251,097 | 237,239
Loans held-for-sale - Estimated Fair Value | 0 |
Loans receivable, net - Estimated Fair Value | 0 |
Federal Home Loan Bank stock - Estimated Fair Value | 3,912 | 3,460
Accrued interest receivable - Estimated Fair Value | 4,131 | 3,632
Financial liabilities, Fair value: |  |
Non-interest bearing deposits - Estimated Fair Value | 0 |
Interest bearing deposits - Estimated Fair Value | 316,795 | 256,732
Repurchase agreements - Estimated Fair Value | 1,765 | 1,759
Borrowed funds - Estimated Fair Value | 18,081 | 42,888
Accrued interest payable - Estimated Fair Value | 166 | 186
Fair Value, Inputs, Level 3 [Member] |  |
Financial assets, Fair value: |  |
Cash and cash equivalents - Estimated Fair Value | 0 |
Certificates of deposit in other financial institutions - Estimated Fair Value | 0 |
Securities available-for-sale - Estimated Fair Value | 2,047 | 2,049
Loans held-for-sale - Estimated Fair Value | 0 |
Loans receivable, net - Estimated Fair Value | 891,109 | $ 747,553
Federal Home Loan Bank stock - Estimated Fair Value | 0 |
Accrued interest receivable - Estimated Fair Value | 0 |
Financial liabilities, Fair value: |  |
Non-interest bearing deposits - Estimated Fair Value | 0 |
Interest bearing deposits - Estimated Fair Value | 0 |
Repurchase agreements - Estimated Fair Value | 0 |
Borrowed funds - Estimated Fair Value | 0 |
Accrued interest payable - Estimated Fair Value | $ 0 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Fair value portion 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. + References No definition available. + Details
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- Definition Amount of 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 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 A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: 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 Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References No definition available. + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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