Allowance for Credit Losses on Loans - Narrative (Details) $ in Thousands			3 Months Ended
	Apr. 23, 2020 USD ($)	Mar. 22, 2020	Mar. 31, 2020 USD ($)	Apr. 27, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Total fund approved by Congress to Small Business Administration (“SBA”) Paycheck Protection Program (“PPP”)			$ 349,000,000
Loans, net			$ 2,509,208		$ 2,510,559
Subsequent Event
Loans and Leases Receivable Disclosure [Line Items]
Additional fund approved by Congress to Small Business Administration (“SBA”) Paycheck Protection Program (“PPP”)	$ 310,000,000
Paycheck Protection Program
Loans and Leases Receivable Disclosure [Line Items]
Number of application processed | item				1,060
Loans, net				$ 330,000
Number of request received for initial payment deferral | item				319
Initial payment deferral requested loan amount				$ 170,000
Initial payment deferral requested loan percentage				7.00%
Paycheck Protection Program | Commercial | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Initial payment deferral requested loan amount				$ 54,000
Paycheck Protection Program | Dentist and physician | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Initial payment deferral requested loan amount				$ 35,000
Paycheck Protection Program | Maximum
Loans and Leases Receivable Disclosure [Line Items]
Initial payment deferral period		90 days
Initial payment additional deferral period		90 days