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Accumulated Other Comprehensive Income (''AOCI'') - Amount Reclassified from AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Gain on sales of securities |  |  |  |  |  |  |  |  | $ 277 | $ 661 | $ 266
Interest income on taxable securities |  |  |  |  |  |  |  |  | 11,637 | 15,836 | 15,211
Income tax expense | $ (4,429) | $ (4,198) | $ (4,274) | $ (868) | $ (2,088) | $ (4,633) | $ (4,623) | $ (4,507) | (13,769) | (15,851) | (13,324)
Net income | $ 11,623 | $ 11,197 | $ 10,618 | $ 1,861 | $ 5,685 | $ 11,277 | $ 11,353 | $ 12,146 | 35,299 | 40,461 | 35,331
Unrealized Gains (Losses) on Available-for-Sale Securities and I/O Strips |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  | 195 | 466 |
Unrealized Gains (Losses) on Available-for-Sale Securities and I/O Strips | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Gain on sales of securities |  |  |  |  |  |  |  |  | 277 | 661 | 266
Income tax expense |  |  |  |  |  |  |  |  | (82) | (195) | (79)
Net income |  |  |  |  |  |  |  |  | 195 | 466 | 187
Unamortized Unrealized Gain on Available-for-Sale Securities Reclassified to Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  | 37 | 46 |
Unamortized Unrealized Gain on Available-for-Sale Securities Reclassified to Held-to-Maturity | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Interest income on taxable securities |  |  |  |  |  |  |  |  | 52 | 65 | 44
Income tax expense |  |  |  |  |  |  |  |  | (15) | (19) | (13)
Net income |  |  |  |  |  |  |  |  | 37 | 46 | 31
Defined Benefit Pension Plan Items |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  | (230) | (62) |
Defined Benefit Pension Plan Items | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Other noninterest expense |  |  |  |  |  |  |  |  | (327) | (88) | (227)
Income tax benefit |  |  |  |  |  |  |  |  | 97 | 26 | 67
Net of tax |  |  |  |  |  |  |  |  | (230) | (62) | (160)
Prior transition obligation | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Other noninterest expense |  |  |  |  |  |  |  |  | 60 | 96 | 65
Actuarial losses | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Other noninterest expense |  |  |  |  |  |  |  |  | (387) | (184) | (292)
Accumulated Other Comprehensive Income / (Loss) |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  | 2 | 450 |
Accumulated Other Comprehensive Income / (Loss) | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  | $ 2 | $ 450 | $ 58

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