Fair Value Measurement (Fair Value, by Balance Sheet Grouping) (Details) - USD ($)		Mar. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale investment securities		$ 145,039,000	$ 62,862,000
Held-to-maturity investment securities		343,023,000	330,626,000
Equity securities		474,000	500,000
Loans held for sale		7,474,000	11,514,000
Net loans and leases		965,314,000	1,010,039,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		758,431,000	913,572,000
Available-for-sale investment securities		145,039,000	62,862,000
Held-to-maturity investment securities		363,145,000	329,257,000
Equity securities		474,000	500,000
Loans held for sale		7,474,000	11,514,000
Net loans and leases		3,106,384,000	3,089,799,000
Restricted investment in bank stocks		7,637,000	9,134,000
Accrued interest receivable		11,584,000	10,779,000
Net Amounts Presented in the Consolidated Balance Sheets		5,298,000	629,000
Mortgage banking derivative assets			88,000
Deposits		3,989,037,000	4,002,016,000
Long-term debt	[1]	71,323,000	77,890,000
Subordinated debt		74,134,000	74,274,000
Accrued interest payable		2,067,000	1,791,000
Mortgage banking derivative liabilities		160,000
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		758,431,000	913,572,000
Available-for-sale investment securities		145,039,000	62,862,000
Held-to-maturity investment securities		343,023,000	330,626,000
Equity securities		474,000	500,000
Loans held for sale		7,482,000	11,787,000
Net loans and leases		3,103,333,000	3,118,416,000
Restricted investment in bank stocks		7,637,000	9,134,000
Accrued interest receivable		11,584,000	10,779,000
Net Amounts Presented in the Consolidated Balance Sheets		5,298,000	629,000
Mortgage banking derivative assets			88,000
Deposits		3,983,980,000	4,046,217,000
Long-term debt	[1]	70,799,000	77,455,000
Subordinated debt		71,796,000	74,553,000
Accrued interest payable		2,067,000	$ 1,791,000
Mortgage banking derivative liabilities		$ 160,000

[1] Long-term debt excludes finance lease obligations.