Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 250	$ 250
Loans, Net	2,700,789	2,712,236
Financial Liabilities:
Time Deposits	(597,771)	(588,483)
Level 1
Financial Assets:
Cash and Short-term Investments	48,634	64,549
Loans, Net	0	0
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,531,061)	(2,848,149)
Time Deposits	0	0
Short-term Borrowings	(106,000)	(204,500)
Long-term Debt	0	0
Accrued Interest Payable	0	0
Level 2
Financial Assets:
Cash and Short-term Investments	41,373	32,001
Loans, Net	0	0
Accrued Interest Receivable	4,389	4,143
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(597,447)	(586,338)
Short-term Borrowings	(36,318)	(45,274)
Long-term Debt	(152,022)	(117,513)
Accrued Interest Payable	(2,040)	(1,718)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Loans, Net	2,684,900	2,689,393
Accrued Interest Receivable	11,821	12,491
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(8,751)	(11,315)
Accrued Interest Payable	(20)	(22)
Carrying Value
Financial Assets:
Cash and Short-term Investments	90,007	96,550
Interest-bearing Time Deposits with Banks	250	250
Loans, Net	2,697,204	2,707,498
Accrued Interest Receivable	16,210	16,634
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,531,061)	(2,484,149)
Time Deposits	(597,771)	(588,483)
Short-term Borrowings	(142,318)	(249,774)
Long-term Debt	(163,622)	(126,635)
Accrued Interest Payable	(2,060)	(1,740)
Total
Financial Assets:
Cash and Short-term Investments	90,007	96,550
Interest-bearing Time Deposits with Banks	250	250
Loans, Net	2,684,900	2,689,393
Accrued Interest Receivable	16,210	16,634
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,531,061)	(2,848,149)
Time Deposits	(597,447)	(586,338)
Short-term Borrowings	(142,318)	(249,774)
Long-term Debt	(160,773)	(128,828)
Accrued Interest Payable	(2,060)	(1,740)
Total | Level 1
Financial Assets:
Interest-bearing Time Deposits with Banks	0	0
Total | Level 2
Financial Assets:
Interest-bearing Time Deposits with Banks	250	250
Total | Level 3
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 0	$ 0