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Fair Value (Carrying Amounts and Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial Assets:
Interest-bearing Time Deposits with Banks	$ 993	$ 1,241
Financial Liabilities:
Time Deposits	(410,735)	(494,452)
Level 1
Financial Assets:
Cash and Short-term Investments	55,491	57,972
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	(4,039,010)	(3,612,078)
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	0	0
Accrued Interest Payable	0	0
Level 2
Financial Assets:
Cash and Short-term Investments	314,592	287,776
Interest-bearing Time Deposits with Banks	993	1,241
Loans, Net	0	0
Accrued Interest Receivable	7,452	6,137
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	(407,366)	(495,171)
Short-term Borrowings	(71,764)	(52,905)
Long-term Debt	(79,550)	(88,342)
Accrued Interest Payable	(711)	(1,049)
Level 3
Financial Assets:
Cash and Short-term Investments	0	0
Interest-bearing Time Deposits with Banks	0	0
Loans, Net	3,023,985	3,032,690
Accrued Interest Receivable	10,775	14,141
Financial Liabilities:
Demand, Savings, and Money Market Deposits	0	0
Time Deposits	0	0
Short-term Borrowings	0	0
Long-term Debt	(51,656)	(54,960)
Accrued Interest Payable	(33)	(35)
Carrying Value
Financial Assets:
Cash and Short-term Investments	370,083	345,748
Interest-bearing Time Deposits with Banks	993	1,241
Loans, Net	3,018,701	3,026,340
Accrued Interest Receivable	18,227	20,278
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,039,010)	(3,612,078)
Time Deposits	(410,735)	(494,452)
Short-term Borrowings	(71,764)	(52,905)
Long-term Debt	(133,742)	(141,624)
Accrued Interest Payable	(744)	(1,084)
Total
Financial Assets:
Cash and Short-term Investments	370,083	345,748
Interest-bearing Time Deposits with Banks	993	1,241
Loans, Net	3,023,985	3,032,690
Accrued Interest Receivable	18,227	20,278
Financial Liabilities:
Demand, Savings, and Money Market Deposits	(4,039,010)	(3,612,078)
Time Deposits	(407,366)	(495,171)
Short-term Borrowings	(71,764)	(52,905)
Long-term Debt	(131,206)	(143,302)
Accrued Interest Payable	$ (744)	$ (1,084)

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