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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 11,803 | $ 78,239
12 Months or More, Fair Value | 1,880 | 43,281
Less Than 12 Months, Unrealized Losses | 352 | 1,035
12 Months or More, Unrealized Losses | 6 | 118
Total, Fair Value | 13,683 | 121,520
Total, Unrealized Losses | 358 | 1,153
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 8,632 | 23,929
Less Than 12 Months, Unrealized Losses | 328 | 815
Total, Fair Value | 8,632 | 23,929
Total, Unrealized Losses | 328 | 815
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 3,149 | 2,684
12 Months or More, Fair Value |  | 1,098
Less Than 12 Months, Unrealized Losses | 23 | 19
12 Months or More, Unrealized Losses |  | 1
Total, Fair Value | 3,149 | 3,782
Total, Unrealized Losses | 23 | 20
U.S. government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 13,695
12 Months or More, Fair Value |  | 36,070
Less Than 12 Months, Unrealized Losses |  | 149
12 Months or More, Unrealized Losses |  | 78
Total, Fair Value |  | 49,765
Total, Unrealized Losses |  | 227
Mortgage-backed Securities, U.S. government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 992
12 Months or More, Fair Value | 1,133 | 2,362
Less Than 12 Months, Unrealized Losses |  | 1
12 Months or More, Unrealized Losses | 3 | 9
Total, Fair Value | 1,133 | 3,354
Total, Unrealized Losses | 3 | 10
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 22 |
12 Months or More, Fair Value | 747 |
Less Than 12 Months, Unrealized Losses | 1 |
12 Months or More, Unrealized Losses | 3 |
Total, Fair Value | 769 |
Total, Unrealized Losses | $ 4 |
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 36,939
12 Months or More, Fair Value |  | 3,751
Less Than 12 Months, Unrealized Losses |  | 51
12 Months or More, Unrealized Losses |  | 30
Total, Fair Value |  | 40,690
Total, Unrealized Losses |  | $ 81

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