Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Gross	$ 257,762	$ 243,195
Less: accumulated depreciation and amortization	(107,998)	(100,926)
Total Bank Premises and Equipment	149,764	142,269
Land [Member]
Property Plant And Equipment [Line Items]
Land	38,380	34,266
Buildings [Member]
Property Plant And Equipment [Line Items]
Buildings	$ 156,350	148,630
Buildings [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	20 years
Buildings [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	40 years
Furniture and Equipment [Member]
Property Plant And Equipment [Line Items]
Furniture and equipment	$ 60,083	57,283
Furniture and Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	10 years
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Leasehold improvements	$ 2,949	$ 3,016
Leasehold Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful Life in years	15 years