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Securities, Gains (Loss) on Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2008
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |
Net securities gain (loss) | $ 356 | $ (288) |  |
Net gain (loss) realized on sales and calls of AFS securities |  | 148 |  |
Realized pre-tax gain on sales and calls of AFS securities | 1 | 281 |  |
Realized pre-tax loss on sales and calls of AFS securities |  | 133 |  |
Unrealized gain from equity securities | 355 |  |  |
Equity securities at fair value | 1,528 |  | $ 1,173 |
Securities pledged as collateral to secure public deposit and for other purposes | 234,800 |  | 258,800 |
Amortized cost of securities sold under agreements to repurchase | 278,000 |  | 289,100 |
CRA Investments Funds [Member] |  |  |  |
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |
Net gain (loss) realized on sales and calls of AFS securities |  | $ (436) |  |
Class B Restricted Stock [Member] |  |  |  |
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |
Number of shares of stock acquired (in shares) |  |  |  | 9,918
Gain on recognition of fair value of equity securities |  |  | $ 1,200 |
Number of shares held in portfolio (in shares) |  |  | 9,918 |
Equity securities at fair value | $ 1,500 |  |  |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Amount, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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