Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 277,157	$ 272,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	10,715	6,455
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,745	2,315
Debt Securities, Available-for-sale	286,127	$ 276,355
CALIFORNIA
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	14,569
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,386
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	15,955
TEXAS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	11,978
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	896
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	12,874
NEW YORK
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,441
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	947
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	11,388
VIRGINIA
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,151
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	566
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	8,717
FLORIDA
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,728
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	589
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4
Debt Securities, Available-for-sale	$ 8,313

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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