Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 250	$ 250
Loans, Net	2,692,589	2,712,236
Financial Liabilities:
Time Deposits	(634,262)	(588,483)
Level 1
Financial Assets:
Cash and Short-term Investments	45,038	64,549
Loans, Net	0	0
Accrued Interest Receivable	0	0
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,430,908)	(2,848,149)
Time Deposits	0	0
Short-term Borrowings	(132,000)	(204,500)
Long-term Debt	0	0
Accrued Interest Payable	0	0
Level 2
Financial Assets:
Cash and Short-term Investments	14,490	32,001
Loans, Net	0	0
Accrued Interest Receivable	4,416	4,143
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(633,879)	(586,338)
Short-term Borrowings	(33,870)	(45,274)
Long-term Debt	(139,361)	(117,513)
Accrued Interest Payable	(2,006)	(1,718)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Loans, Net	2,677,169	2,689,393
Accrued Interest Receivable	12,845	12,491
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(11,160)	(11,315)
Accrued Interest Payable	(82)	(22)
Carrying Value
Financial Assets:
Cash and Short-term Investments	59,528	96,550
Interest-bearing Time Deposits with Banks	250	250
Loans, Net	2,688,521	2,707,498
Accrued Interest Receivable	17,261	16,634
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,430,908)	(2,484,149)
Time Deposits	(634,262)	(588,483)
Short-term Borrowings	(165,870)	(249,774)
Long-term Debt	(151,610)	(126,635)
Accrued Interest Payable	(2,088)	(1,740)
Total
Financial Assets:
Cash and Short-term Investments	59,528	96,550
Interest-bearing Time Deposits with Banks	250	250
Loans, Net	2,677,169	2,689,393
Accrued Interest Receivable	17,261	16,634
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(2,430,908)	(2,848,149)
Time Deposits	(633,879)	(586,338)
Short-term Borrowings	(165,870)	(249,774)
Long-term Debt	(150,521)	(128,828)
Accrued Interest Payable	(2,088)	(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