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Securities - Additional Information (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
security
Debt Securities, Available-for-sale [Line Items]      
Number of debt securities in unrealized loss position | security 65   51
Securities pledged for regulatory and legal requirements $ 236,000   $ 249,000
AOCI Attributable to Parent | ASU No. 2016-01      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities   $ (900) (862) [1]
Retained Earnings | ASU No. 2016-01      
Debt Securities, Available-for-sale [Line Items]      
Reclassification of net unrealized gains on equity securities   $ 900 $ 862 [1]
[1] Reclassification due to the adoption of ASU No. 2016-01, related to changes in fair value for equity securities reclassified out of accumulated other comprehensive income