Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 1,489	$ 1,985
Loans, Net	3,174,359	3,060,813
Financial Liabilities:
Time Deposits	(515,034)	(631,396)
Level 1
Financial Assets:
Cash and Short-term Investments	56,706	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	(3,464,640)	(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	192,987	43,913
Interest-bearing Time Deposits with Banks	1,489	1,985
Loans, Net	0	0
Accrued Interest Receivable	5,435	4,400
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(514,811)	(624,666)
Short-term Borrowings	(72,891)	(39,425)
Long-term Debt	(88,629)	(127,174)
Accrued Interest Payable	(1,731)	(2,376)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest-bearing Time Deposits with Banks	0	0
Loans, Net	3,175,885	3,056,521
Accrued Interest Receivable	15,017	14,025
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(55,449)	(55,234)
Accrued Interest Payable	(37)	(66)
Carrying Value
Financial Assets:
Cash and Short-term Investments	249,693	103,884
Interest-bearing Time Deposits with Banks	1,489	1,985
Loans, Net	3,159,082	3,058,211
Accrued Interest Receivable	20,452	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(3,464,640)	(2,798,625)
Time Deposits	(515,034)	(631,396)
Short-term Borrowings	(72,981)	(167,736)
Long-term Debt	(141,563)	(181,950)
Accrued Interest Payable	(1,768)	(2,442)
Total
Financial Assets:
Cash and Short-term Investments	249,693	103,884
Interest-bearing Time Deposits with Banks	1,489	1,985
Loans, Net	3,175,885	3,056,521
Accrued Interest Receivable	20,452	18,425
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(3,464,640)	(2,798,625)
Time Deposits	(514,811)	(624,666)
Short-term Borrowings	(72,891)	(167,736)
Long-term Debt	(144,078)	(182,408)
Accrued Interest Payable	$ (1,768)	$ (2,442)