Allowance for Credit Losses and Credit Quality of Loans, Credit Quality Indicators (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Minimum number of days past due for loans to be considered nonperforming	90 days
Credit Quality by Loan Class [Abstract]
2020	$ 1,927,429
2019	1,312,819
2018	949,810
2017	750,728
2016	515,688
Prior	1,262,066
Revolving Loans Amortized Cost Basis	749,657
Revolving Loans Converted to Term	30,688
Total	7,498,885
C&I [Member]
Credit Quality by Loan Class [Abstract]
2020	352,323
2019	195,227
2018	106,502
2017	50,153
2016	35,040
Prior	39,712
Revolving Loans Amortized Cost Basis	346,233
Revolving Loans Converted to Term	426
Total	1,125,616
C&I [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2020	331,921
2019	182,329
2018	91,230
2017	41,856
2016	32,625
Prior	32,609
Revolving Loans Amortized Cost Basis	322,674
Revolving Loans Converted to Term	412
Total	1,035,656
C&I [Member] | Special Mention [Member]
Credit Quality by Loan Class [Abstract]
2020	20,064
2019	6,534
2018	5,053
2017	4,702
2016	1,624
Prior	2,830
Revolving Loans Amortized Cost Basis	13,614
Revolving Loans Converted to Term	0
Total	54,421
C&I [Member] | Substandard [Member]
Credit Quality by Loan Class [Abstract]
2020	338
2019	6,364
2018	10,219
2017	3,388
2016	791
Prior	4,272
Revolving Loans Amortized Cost Basis	9,945
Revolving Loans Converted to Term	14
Total	35,331
C&I [Member] | Doubtful [Member]
Credit Quality by Loan Class [Abstract]
2020	0
2019	0
2018	0
2017	207
2016	0
Prior	1
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	208
CRE [Member]
Credit Quality by Loan Class [Abstract]
2020	472,506
2019	412,425
2018	296,712
2017	342,604
2016	255,045
Prior	496,867
Revolving Loans Amortized Cost Basis	115,926
Revolving Loans Converted to Term	20,200
Total	2,412,285
CRE [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2020	469,919
2019	361,187
2018	256,154
2017	271,874
2016	212,197
Prior	383,690
Revolving Loans Amortized Cost Basis	113,128
Revolving Loans Converted to Term	4,034
Total	2,072,183
CRE [Member] | Special Mention [Member]
Credit Quality by Loan Class [Abstract]
2020	2,051
2019	44,034
2018	22,260
2017	55,039
2016	36,830
Prior	43,537
Revolving Loans Amortized Cost Basis	1,297
Revolving Loans Converted to Term	11,524
Total	216,572
CRE [Member] | Substandard [Member]
Credit Quality by Loan Class [Abstract]
2020	536
2019	5,307
2018	18,298
2017	15,691
2016	6,018
Prior	62,168
Revolving Loans Amortized Cost Basis	1,501
Revolving Loans Converted to Term	4,642
Total	114,161
CRE [Member] | Doubtful [Member]
Credit Quality by Loan Class [Abstract]
2020	0
2019	1,897
2018	0
2017	0
2016	0
Prior	7,472
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	9,369
PPP [Member]
Credit Quality by Loan Class [Abstract]
2020	430,810
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	430,810
PPP [Member] | Pass [Member]
Credit Quality by Loan Class [Abstract]
2020	430,810
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	430,810
Auto [Member]
Credit Quality by Loan Class [Abstract]
2020	198,240
2019	315,174
2018	202,985
2017	116,502
2016	45,932
Prior	13,250
Revolving Loans Amortized Cost Basis	22
Revolving Loans Converted to Term	0
Total	892,105
Auto [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2020	197,881
2019	314,034
2018	201,850
2017	115,977
2016	45,495
Prior	13,250
Revolving Loans Amortized Cost Basis	22
Revolving Loans Converted to Term	0
Total	888,509
Auto [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2020	359
2019	1,140
2018	1,135
2017	525
2016	437
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	3,596
Other Consumer [Member]
Credit Quality by Loan Class [Abstract]
2020	234,967
2019	178,829
2018	127,856
2017	55,941
2016	14,345
Prior	17,547
Revolving Loans Amortized Cost Basis	18,598
Revolving Loans Converted to Term	71
Total	648,154
Other Consumer [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2020	234,628
2019	178,411
2018	127,549
2017	55,676
2016	14,255
Prior	17,414
Revolving Loans Amortized Cost Basis	18,588
Revolving Loans Converted to Term	71
Total	646,592
Other Consumer [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2020	339
2019	418
2018	307
2017	265
2016	90
Prior	133
Revolving Loans Amortized Cost Basis	10
Revolving Loans Converted to Term	0
Total	1,562
Residential [Member]
Credit Quality by Loan Class [Abstract]
2020	238,583
2019	211,164
2018	215,755
2017	185,528
2016	165,326
Prior	694,690
Revolving Loans Amortized Cost Basis	268,878
Revolving Loans Converted to Term	9,991
Total	1,989,915
Residential [Member] | Performing [Member]
Credit Quality by Loan Class [Abstract]
2020	237,338
2019	210,505
2018	213,437
2017	182,993
2016	164,424
Prior	684,495
Revolving Loans Amortized Cost Basis	268,878
Revolving Loans Converted to Term	9,991
Total	1,972,061
Residential [Member] | Nonperforming [Member]
Credit Quality by Loan Class [Abstract]
2020	1,245
2019	659
2018	2,318
2017	2,535
2016	902
Prior	10,195
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	$ 17,854