Loans and the Allowance for Credit Losses (Details) - Aging analysis - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 65,959	$ 61,696
Total Past Due and Nonaccrual	83,482	98,000
Gross Loans	6,587,896	6,247,681
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	30,479	33,019
Total Past Due and Nonaccrual	35,750	38,204
Gross Loans	2,093	1,521,967
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	28,578	10,111
Total Past Due and Nonaccrual	32,132	33,064
Gross Loans	270,793	3,783,550
Commercial Construction Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,336	14,015
Total Past Due and Nonaccrual	3,336	16,487
Gross Loans	552,896	617,747
Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,566	4,551
Total Past Due and Nonaccrual	12,264	10,243
Gross Loans	4,436,626	322,564
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual
Total Past Due and Nonaccrual		2
Gross Loans	1,325,488	1,853
Current [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	6,504,414	6,149,681
Current [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	1,289,738	1,483,763
Current [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	4,404,494	3,750,486
Current [Member] \| Commercial Construction Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	549,560	601,260
Current [Member] \| Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	258,529	312,321
Current [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	2,093	1,851
30 - 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	729	18,544
30 - 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	391	1,445
30 - 59 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual		13,258
30 - 59 Days Past Due [Member] \| Commercial Construction Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual		2,472
30 - 59 Days Past Due [Member] \| Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	338	1,367
30 - 59 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual		2
60 - 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	2,111	4,939
60 - 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	417	558
60 - 89 Days Past Due [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	1,694	4,140
60 - 89 Days Past Due [Member] \| Commercial Construction Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual
60 - 89 Days Past Due [Member] \| Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual		241
60 - 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual
90 Days or Greater Past Due and Still Accruing [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	14,683	12,821
90 Days or Greater Past Due and Still Accruing [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	4,463	3,182
90 Days or Greater Past Due and Still Accruing [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	1,860	5,555
90 Days or Greater Past Due and Still Accruing [Member] \| Commercial Construction Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual
90 Days or Greater Past Due and Still Accruing [Member] \| Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual	8,360	4,084
90 Days or Greater Past Due and Still Accruing [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Nonaccrual