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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]      
Income tax expense at statutory rates $ 35,567 $ 28,219 $ 51,792
Tax of exempt income, net (7,272) (8,728) (6,645)
Disallowed net operating loss carryover 202 384 269
Change in valuation allowance 2,267 1,217 1,504
Unrecognized tax benefits, net (1,941) 1,794 (386)
Capital gain at preferential rate (450) (265) (20)
Effect of change in tax rate 0 0 4,069
Tax rate difference (ordinary vs capital) (4,218) 0 0
Bargain purchase gain (2,751) (118) 0
Other items, net (905) (1,094) (2,193)
Total income tax expense $ 20,499 $ 21,409 $ 48,390
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]      
Income tax expense at statutory rates 37.51% 37.50% 39.00%
Tax of exempt income, net (7.67%) (11.60%) (5.01%)
Disallowed net operating loss carryover 0.21% 0.51% 0.20%
Change in valuation allowance 2.39% 1.62% 1.13%
Unrecognized tax benefits, net (2.05%) 2.38% (0.29%)
Capital gain at preferential rate (0.47%) (0.35%) (0.02%)
Effect of change in tax rate 0.00% 0.00% 3.06%
Tax rate difference (ordinary vs capital) (4.45%) 0.00% 0.00%
Bargain purchase gain (2.90%) (0.16%) 0.00%
Other items, net (0.95%) (1.44%) (1.63%)
Income tax expense 21.62% 28.46% 36.44%