Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 1,985	$ 1,985
Loans, Net	2,977,092	3,060,813
Financial Liabilities:
Time Deposits	(599,910)	(631,396)
Level 1
Financial Assets:
Cash and Short-term Investments	48,293	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	(2,878,604)	(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	41,847	43,913
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	0	0
Accrued Interest Receivable	4,459	4,400
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(600,913)	(624,666)
Short-term Borrowings	(33,523)	(39,425)
Long-term Debt	(121,827)	(127,174)
Accrued Interest Payable	(2,611)	(2,376)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest-bearing Time Deposits with Banks	0	0
Loans, Net	2,971,821	3,056,521
Accrued Interest Receivable	13,566	14,025
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(55,313)	(55,234)
Accrued Interest Payable	(61)	(66)
Carrying Value
Financial Assets:
Cash and Short-term Investments	90,140	103,884
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	2,966,963	3,058,211
Accrued Interest Receivable	18,025	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,878,604)	(2,798,625)
Time Deposits	(599,910)	(631,396)
Short-term Borrowings	(33,523)	(167,736)
Long-term Debt	(174,442)	(181,950)
Accrued Interest Payable	(2,672)	(2,442)
Total
Financial Assets:
Cash and Short-term Investments	90,140	103,884
Interest-bearing Time Deposits with Banks	1,985	1,985
Loans, Net	2,971,821	3,056,521
Accrued Interest Receivable	18,025	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,878,604)	(2,798,625)
Time Deposits	(600,913)	(624,666)
Short-term Borrowings	(33,523)	(167,736)
Long-term Debt	(177,140)	(182,408)
Accrued Interest Payable	$ (2,672)	$ (2,442)