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Summary of Significant Accounting Policies - Paycheck Protection Program (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amount recognized in net loan fees	$ 88,118,000	$ 90,992,000	$ 87,519,000
Minimum
Fees as percentage of principal amount (as a percent)	1.00%
Maximum
Fees as percentage of principal amount (as a percent)	5.00%
Paycheck Protection Program
Aggregate fees	$ 6,310,000
Unrecognized aggregate fees	679,000
Amount recognized in net loan fees	$ 4,060,000.00	$ 1,560,000

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- Definition

Percentage of fees the Corporation received from the Small Business Administration (SBA) of the principal amount of each loan originated under the Paycheck Protection Program (PPP).

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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-SubTopic 210
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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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