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COVID-19 Pandemic Implications (Narrative) (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount	$ 2,370,429,000	$ 2,384,041,000	$ 2,370,429,000	$ 2,521,827,000	$ 2,370,429,000	$ 2,521,827,000	$ 2,384,041,000	$ 2,370,429,000
CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount	$ 3,571,000	$ 11,681,000	$ 3,571,000		$ 3,571,000		$ 11,681,000	$ 3,571,000
Maximum [Member] | CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Qualifying deferment status percentage of loan portfolio	1.00%	1.00%	1.00%		1.00%		1.00%	1.00%
Coronavirus Aid, Relief, and Economic Security Act [Member] | CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount	$ 3,571,000	$ 11,681,000	$ 3,571,000		$ 3,571,000		$ 11,681,000	$ 3,571,000
Coronavirus Aid, Relief, and Economic Security Act [Member] | Maximum [Member] | CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Qualifying deferment status percentage of loan portfolio	1.00%	1.00%	1.00%		1.00%		1.00%	1.00%
PPP Loans [Member] | Small Business Administration [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan guarantee description					The PPP loans, which are 100 percent guaranteed by the SBA, have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.
Nonrefundable loan processing fees received					$ 17,997,000		$ 20,883,000	$ 38,880,000
Loan processing fees			$ 6,237,000	2,583,000	$ 17,528,000	4,954,000
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan guarantee description					The PPP loans, which are 100 percent guaranteed by the SBA, have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.
Nonrefundable loan processing fees received	$ 38,880,000				$ 17,997,000		20,883,000
Deferred loan processing fees not yet realized	$ 8,236,000	$ 7,746,000			$ 8,146,000		$ 90,000
Amortization of loan processing fees description					being amortized to interest and fees on loans and leases on the Consolidated Statements of Income over the life of each respective loan.
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member] | Interest and Fees on Loans and Leases [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan processing fees			$ 6,238,000	$ 2,583,000	$ 17,528,000	$ 4,954,000
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member] | Minimum [Member]
Unusual Risk Or Uncertainty [Line Items]
Percentage of processing fee per loan					1.00%
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member] | Maximum [Member]
Unusual Risk Or Uncertainty [Line Items]
Percentage of processing fee per loan					5.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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