Loans - Summary of Term Loans by Origination Year (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 275,450
2019	662,041
2018	342,408
2017	204,356
2016	81,771
Prior	130,551
Financing Receivable, Converted	3,494
Revolving Loans	753,811
Total	2,453,882
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	274,021
2019	623,511
2018	328,712
2017	188,489
2016	53,064
Prior	126,446
Financing Receivable, Converted	2,557
Revolving Loans	660,675
Total	2,257,475
Commercial and industrial | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	780
2019	17,643
2018	5,258
2017	11,986
2016	23,454
Prior	524
Financing Receivable, Converted	506
Revolving Loans	66,449
Total	126,600
Commercial and industrial | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	649
2019	20,887
2018	8,438
2017	3,881
2016	5,253
Prior	3,581
Financing Receivable, Converted	431
Revolving Loans	26,687
Total	69,807
Commercial Real Estate-Investor Owned Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	114,482
2019	367,472
2018	239,178
2017	155,251
2016	186,483
Prior	210,328
Financing Receivable, Converted	1,745
Revolving Loans	52,875
Total	1,327,814
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	114,369
2019	356,099
2018	229,830
2017	154,406
2016	173,623
Prior	204,948
Financing Receivable, Converted	1,745
Revolving Loans	52,875
Total	1,287,895
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	113
2019	10,395
2018	1,305
2017	400
2016	12,614
Prior	1,623
Financing Receivable, Converted	0
Revolving Loans	0
Total	26,450
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	978
2018	8,043
2017	445
2016	246
Prior	3,757
Financing Receivable, Converted	0
Revolving Loans	0
Total	13,469
Commercial Real Estate-Owner Occupied Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	53,157
2019	236,495
2018	105,500
2017	99,654
2016	67,140
Prior	105,629
Financing Receivable, Converted	2,797
Revolving Loans	50,171
Total	720,543
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	50,382
2019	226,562
2018	99,918
2017	89,750
2016	58,499
Prior	96,149
Financing Receivable, Converted	2,797
Revolving Loans	44,271
Total	668,328
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,775
2019	8,802
2018	370
2017	9,904
2016	8,641
Prior	5,313
Financing Receivable, Converted	0
Revolving Loans	5,900
Total	41,705
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1,131
2018	5,212
2017	0
2016	0
Prior	4,167
Financing Receivable, Converted	0
Revolving Loans	0
Total	10,510
Construction Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24,001
2019	196,235
2018	125,193
2017	63,103
2016	28,407
Prior	15,278
Financing Receivable, Converted	0
Revolving Loans	17,410
Total	469,627
Construction Real Estate Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,035
2019	184,561
2018	123,931
2017	63,034
2016	28,407
Prior	14,672
Financing Receivable, Converted	0
Revolving Loans	17,410
Total	455,050
Construction Real Estate Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	966
2019	11,448
2018	1,262
2017	69
2016	0
Prior	563
Financing Receivable, Converted	0
Revolving Loans	0
Total	14,308
Construction Real Estate Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	226
2018	0
2017	0
2016	0
Prior	43
Financing Receivable, Converted	0
Revolving Loans	0
Total	269
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	12,357
2019	40,571
2018	25,023
2017	24,319
2016	38,217
Prior	138,280
Financing Receivable, Converted	245
Revolving Loans	66,802
Total	345,814
Residential Portfolio Segment | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	12,356
2019	37,811
2018	23,381
2017	24,306
2016	38,082
Prior	132,715
Financing Receivable, Converted	245
Revolving Loans	65,660
Total	334,556
Residential Portfolio Segment | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1
2019	1,045
2018	875
2017	0
2016	4
Prior	2,683
Financing Receivable, Converted	0
Revolving Loans	1,093
Total	5,701
Residential Portfolio Segment | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1,715
2018	767
2017	13
2016	131
Prior	2,882
Financing Receivable, Converted	0
Revolving Loans	49
Total	5,557
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,257
2019	26,482
2018	20,915
2017	1,741
2016	5,535
Prior	35,965
Financing Receivable, Converted	10
Revolving Loans	29,336
Total	121,241
Consumer and other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,257
2019	26,478
2018	20,911
2017	1,735
2016	5,535
Prior	35,940
Financing Receivable, Converted	0
Revolving Loans	29,311
Total	121,167
Consumer and other | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2
2018	0
2017	0
2016	0
Prior	1
Financing Receivable, Converted	0
Revolving Loans	1
Total	4
Consumer and other | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2
2018	4
2017	6
2016	0
Prior	24
Financing Receivable, Converted	10
Revolving Loans	24
Total	$ 70