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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 29,467 $ 36,155
Less than 12 Months, Unrealized Losses 423 507
12 Months or More, Fair Value 13,848 10,123
12 Months or More, Unrealized Losses 261 209
Total, Fair Value 43,315 46,278
Total, Unrealized Losses 684 716
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 16,534 15,594
Less than 12 Months, Unrealized Losses 321 290
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 16,534 15,594
Total, Unrealized Losses 321 290
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 5,832 10,120
Less than 12 Months, Unrealized Losses 28 94
12 Months or More, Fair Value 13,286 9,562
12 Months or More, Unrealized Losses 234 180
Total, Fair Value 19,118 19,682
Total, Unrealized Losses 262 274
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 7,101 10,441
Less than 12 Months, Unrealized Losses 74 123
12 Months or More, Fair Value 562 561
12 Months or More, Unrealized Losses 27 29
Total, Fair Value 7,663 11,002
Total, Unrealized Losses $ 101 $ 152