Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 1,985	$ 1,985
Loans, Net	3,223,916	3,060,813
Financial Liabilities:
Time Deposits	(572,413)	(631,396)
Level 1
Financial Assets:
Cash and Short-term Investments	53,081	59,971
Interest-bearing Time Deposits with Banks	0	0
Loans, Net	0	0
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(3,407,020)	(2,798,625)
Time Deposits	0	0
Short-term Borrowings	0	(128,311)
Long-term Debt	0	0
Accrued Interest Payable	0	0
Level 2
Financial Assets:
Cash and Short-term Investments	225,290	43,913
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	0	0
Accrued Interest Receivable	4,871	4,400
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(573,674)	(624,666)
Short-term Borrowings	(73,199)	(39,425)
Long-term Debt	(93,981)	(127,174)
Accrued Interest Payable	(2,038)	(2,376)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest-bearing Time Deposits with Banks	0	0
Loans, Net	3,229,626	3,056,521
Accrued Interest Receivable	14,776	14,025
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(55,378)	(55,234)
Accrued Interest Payable	(49)	(66)
Carrying Value
Financial Assets:
Cash and Short-term Investments	278,371	103,884
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	3,215,229	3,058,211
Accrued Interest Receivable	19,647	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(3,407,020)	(2,798,625)
Time Deposits	(572,413)	(631,396)
Short-term Borrowings	(73,199)	(167,736)
Long-term Debt	(146,501)	(181,950)
Accrued Interest Payable	(2,087)	(2,442)
Total
Financial Assets:
Cash and Short-term Investments	278,371	103,884
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	3,229,626	3,056,521
Accrued Interest Receivable	19,647	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(3,407,020)	(2,798,625)
Time Deposits	(573,674)	(624,666)
Short-term Borrowings	(73,199)	(167,736)
Long-term Debt	(149,359)	(182,408)
Accrued Interest Payable	$ (2,087)	$ (2,442)