Loans - Credit Risk Profile (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 2,919,981	$ 2,698,844
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	6,164	792
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,286,517	1,990,440
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,260,087	1,971,570
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	15,186	10,921
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	11,244	7,949
Commercial loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	96,420	107,405
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	89,818	100,689
Commercial loans | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,973	1,076
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,629	5,640
Commercial loans | Commercial and industrial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	226	195
Commercial loans | Owner-occupied commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	73,392	77,569
Commercial loans | Owner-occupied commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	71,068	73,593
Commercial loans | Owner-occupied commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,727	2,623
Commercial loans | Owner-occupied commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	597	1,353
Commercial loans | Owner-occupied commercial real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	464	325
Commercial loans | Investor commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,567	5,391
Commercial loans | Investor commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,567	5,391
Commercial loans | Investor commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Investor commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Investor commercial real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total	60,274	39,916
Commercial loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	60,274	39,916
Commercial loans | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Construction | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Single tenant lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	995,879	919,440
Commercial loans | Single tenant lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	983,448	913,984
Commercial loans | Single tenant lease financing | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	7,751	5,456
Commercial loans | Single tenant lease financing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,680	0
Commercial loans | Single tenant lease financing | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,680	0
Commercial loans | Public finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total	687,094	706,342
Commercial loans | Public finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	687,094	706,342
Commercial loans | Public finance | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Public finance | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Public finance | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Healthcare finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total	300,612	117,007
Commercial loans | Healthcare finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	300,612	117,007
Commercial loans | Healthcare finance | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Healthcare finance | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Healthcare finance | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial loans | Small business lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total	60,279	17,370
Commercial loans | Small business lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	55,206	14,648
Commercial loans | Small business lending | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,735	1,766
Commercial loans | Small business lending | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,338	956
Commercial loans | Small business lending | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	633,464	708,404
Consumer loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	632,670	708,132
Consumer loans | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	794	272
Consumer loans | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total	313,849	399,898
Consumer loans | Residential mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	313,088	399,723
Consumer loans | Residential mortgage | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	761	175
Consumer loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	24,306	28,735
Consumer loans | Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	24,306	28,680
Consumer loans | Home equity | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	55
Consumer loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	295,309	279,771
Consumer loans | Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	295,276	279,729
Consumer loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 33	$ 42