Securities Available for Sale - Proceeds, Gains and Losses (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Debt Instrument [Line Items] | |||
Proceeds from investments sold | $ 128,791 | $ 217,079 | $ 22,510 |
Gains from sales/calls of securities | 402 | 1,032 | 437 |
Losses from sales of securities | (101) | (84) | (13) |
Net gain on sales or called securities | 301 | 950 | 424 |
Call Option [Member] | |||
Debt Instrument [Line Items] | |||
Gains from sales/calls of securities | $ 0 | $ 2 | $ 0 |