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Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 160,566	$ 146,477
Less: accumulated depreciation and amortization	(76,780)	(65,372)
Total Premises and Equipment, net	83,786	81,105
Land [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	4,363	4,363
Building And Improvements [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 75,974	74,840
Property Plant And Equipment Useful Life	40 years
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 22,439	21,358
Leasehold Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	10 years
Leasehold Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	5 years
Furniture And Fixtures [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 17,517	16,686
Furniture And Fixtures [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years
Furniture And Fixtures [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	3 years
Information Technology And Other [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 40,273	$ 29,230
Information Technology And Other [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years
Information Technology And Other [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	3 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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