Derivative Financial Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) Contract	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($)	Apr. 04, 2013 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Accumulated net, after tax gain included in accumulated other comprehensive loss	$ 497,000	$ 198,000	$ (369,000)
Mortgage Servicing Rights Hedge [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	318,000,000	349,000,000
Net (negative) positive ineffectiveness on MSR fair value	$ 2,400,000	254,000	(2,900,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period for which cash flow hedges will be used to hedge quarterly interest payments	5 years
Derivative inception date	Dec. 31, 2014
Derivative maturity date	Dec. 31, 2019
Description of variable rate basis for derivative	three-month LIBOR
Ineffectiveness related to interest rate swap designated as a cash flow hedge	$ 0	0	$ 0
Accumulated net, after tax gain included in accumulated other comprehensive loss	$ 469,000	$ 278,000
The period over which OCI will be reclassified as interest expense	12 months
Estimated amount to be reclassified as a decrease to interest expense	$ 625,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Junior Subordinated Debentures [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount				$ 60,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Three-month LIBOR [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Swap fixed interest rate to be paid	1.66%
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	3	2
Aggregate notional amount of credit risk participation agreements	$ 23,100,000	$ 13,700,000
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	7	6
Aggregate notional amount of credit risk participation agreements	$ 39,000,000	$ 37,100,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	475,800,000	351,900,000
Termination value of derivatives	75,000	80,000
Collateral Posted	0
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	132,000,000	182,100,000
Valuation adjustment	(1,800,000)	(237,000)
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	71,200,000	83,000,000
Valuation adjustment	$ 1,200,000	$ 900,000