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Accumulated Other Comprehensive Income (Loss) (Components of unrealized holding gains on AFS securities) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) on AFS securities arising during the period $ (1,690) $ (66) $ (4,247) $ 8,304
Reclassification adjustment for net (gains) losses included in net income 0 0 0 (71)
Tax effect [1] 353 58 894 (1,714)
Unrealized gains (losses), net of tax (1,337) 8 (3,311) 6,404
Unrealized Holding Gains (Losses) on AFS Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) on AFS securities arising during the period (1,690) (66) (4,247) 8,304
Reclassification adjustment for net (gains) losses included in net income     0 (71)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent     (4,247) 8,233
Tax effect 353 58 894 (1,714)
Unrealized gains (losses), net of tax (1,337) (8) (3,353) 6,519
Unrealized Holding Gains (Losses) on AFS Securities [Member] | Auction Rate Money Market Preferred and Preferred Stocks [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) on AFS securities arising during the period (14) 215 9 75
Reclassification adjustment for net (gains) losses included in net income     0 0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent     9 75
Tax effect 0 0 0 0
Unrealized gains (losses), net of tax (14) 215 9 75
Unrealized Holding Gains (Losses) on AFS Securities [Member] | All Other AFS Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) on AFS securities arising during the period (1,676) (281) (4,256) 8,229
Reclassification adjustment for net (gains) losses included in net income     0 (71)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent     (4,256) 8,158
Tax effect 353 58 894 (1,714)
Unrealized gains (losses), net of tax (1,323) (223) (3,362) 6,444
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses), net of tax $ 0 $ 0 $ 0 $ 0
[1] See “Note 10 – Accumulated Other Comprehensive Income” for tax effect reconciliation.