Loans - Summary of Delinquent and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	$ 30,039	$ 23,685
90 Days or More Past Due and Still Accruing		403
Nonaccrual Past Due and Still Accruing	15,512	12,867
Current	5,099,967	4,512,200
Loans, net of deferred fees	5,136,812	4,547,633
Total loans	$ 5,130,006	$ 4,535,885
Percentage of Total Loans Due 30-59 Days	0.18%	0.19%
Percentage of Total Loans Due 60-89 Days	0.10%	0.04%
Percentage of Total Loans Due 90 Days or More		0.01%
Percentage of Total Loans Due Nonaccrual	0.30%	0.28%
Percentage of Total Loans	0.59%	0.52%
Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,395,869	$ 3,015,100
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	774,939	834,042
Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	8,384	11,416
Nonaccrual Past Due and Still Accruing	5,648	8,714
Current	867,080	588,797
Total loans	875,464	600,213
Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	367	25
Nonaccrual Past Due and Still Accruing	17
Current	18,273	16,248
Total loans	18,640	16,273
Land
Accounts Notes And Loans Receivable [Line Items]
Total loans	65,094	70,257
30-59 Days
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	9,228	8,392
30-59 Days | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	2,051	695
30-59 Days | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	350	22
60-89 Days
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	5,299	2,023
60-89 Days | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	685	2,007
60-89 Days | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual		3
Real Estate Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,235,902	3,919,399
Real Estate Loans | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	12,599	1,845
Nonaccrual Past Due and Still Accruing	7,027	1,743
Current	3,383,270	3,013,255
Total loans	3,395,869	3,015,100
Real Estate Loans | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	7,734	10,399
90 Days or More Past Due and Still Accruing		403
Nonaccrual Past Due and Still Accruing	2,320	2,410
Current	767,205	823,643
Total loans	774,939	834,042
Real Estate Loans | Land
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	955
Nonaccrual Past Due and Still Accruing	500
Current	64,139	70,257
Total loans	65,094	70,257
Real Estate Loans | 30-59 Days | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	5,572	89
Real Estate Loans | 30-59 Days | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	1,255	7,586
Real Estate Loans | 60-89 Days | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual		$ 13
Real Estate Loans | 60-89 Days | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	4,159
Real Estate Loans | 60-89 Days | Land
Accounts Notes And Loans Receivable [Line Items]
Total Past Due and Nonaccrual	$ 455