Allowance for Credit Losses - Balance in Allowance for Credit Losses and Recorded Investment in Loans by Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Individually Evaluated for Impairment	$ 1,203	$ 870
Allowance for Credit Losses, Collectively Evaluated for Impairment	26,926	19,930
Total Allowance for Credit Losses	28,129	20,800
Total Allowance for Credit Losses	28,129	20,800
Unaccreted Credit Component Other Loans		2,345
Loans, Individually Evaluated for Impairment	18,686	18,902
Loans, Collectively Evaluated for Impairment	5,105,183	4,512,467
Loans, Purchased Impaired	5,108,683	4,526,833
Total loans	5,130,006	4,535,885
Unaccreted Credit Component Other Loans		443,765
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable Impaired [Line Items]
Loans, Purchased Impaired	6,137	4,516
Residential Properties
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Individually Evaluated for Impairment	34
Allowance for Credit Losses, Collectively Evaluated for Impairment	6,722	8,423
Total Allowance for Credit Losses	6,756	8,423
Unaccreted Credit Component Other Loans		1,013
Loans, Individually Evaluated for Impairment	5,556	2,897
Loans, Collectively Evaluated for Impairment	3,390,022	3,012,203
Total loans	3,395,869	3,015,100
Unaccreted Credit Component Other Loans		189,339
Residential Properties | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable Impaired [Line Items]
Loans, Purchased Impaired	291
Commercial Real Estate
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Individually Evaluated for Impairment	385	107
Allowance for Credit Losses, Collectively Evaluated for Impairment	8,926	4,059
Total Allowance for Credit Losses	9,311	4,166
Unaccreted Credit Component Other Loans		1,048
Loans, Individually Evaluated for Impairment	6,546	6,689
Loans, Collectively Evaluated for Impairment	762,864	824,026
Total loans	774,939	834,042
Unaccreted Credit Component Other Loans		201,370
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable Impaired [Line Items]
Loans, Purchased Impaired	5,529	3,327
Commercial and Industrial Loans
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Individually Evaluated for Impairment	784	763
Allowance for Credit Losses, Collectively Evaluated for Impairment	7,704	6,685
Total Allowance for Credit Losses	8,488	7,448
Unaccreted Credit Component Other Loans		277
Loans, Individually Evaluated for Impairment	6,067	9,316
Loans, Collectively Evaluated for Impairment	869,080	590,489
Total loans	875,464	600,213
Unaccreted Credit Component Other Loans		24,143
Commercial and Industrial Loans | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable Impaired [Line Items]
Loans, Purchased Impaired	317	408
Consumer Loans
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Collectively Evaluated for Impairment	206	190
Total Allowance for Credit Losses	206	190
Unaccreted Credit Component Other Loans		1
Loans, Individually Evaluated for Impairment	17
Loans, Collectively Evaluated for Impairment	18,623	16,273
Total loans	18,640	16,273
Unaccreted Credit Component Other Loans		253
Land
Financing Receivable Impaired [Line Items]
Allowance for Credit Losses, Collectively Evaluated for Impairment	3,368	573
Total Allowance for Credit Losses	3,368	573
Unaccreted Credit Component Other Loans		6
Loans, Individually Evaluated for Impairment	500
Loans, Collectively Evaluated for Impairment	64,594	69,476
Total loans	$ 65,094	70,257
Unaccreted Credit Component Other Loans		28,660
Land | Receivables Acquired with Deteriorated Credit Quality
Financing Receivable Impaired [Line Items]
Loans, Purchased Impaired		$ 781