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Deposits - Scheduled Maturities of Time Deposits, Including Certificates of Deposits, Individual Retirement Accounts and Brokered Deposits (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Deposits [Abstract]  
Within one year $ 851,311
After one but within two years 185,402
After two but within three years 45,789
After three but within four years 32,054
After four but within five years 20,058
Total $ 1,134,614