Derivatives and Hedging (Details) - USD ($)		3 Months Ended		6 Months Ended
	Sep. 22, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 10,599,000		$ 10,599,000		$ 2,749,000
Derivative Asset, Fair Value, Gross Liability		0		0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		10,599,000		10,599,000		2,749,000
Derivative Asset Netting Adjustment Per Applicable Master Netting Agreements		1,547,000		1,547,000		479,000
Impaired Financing Receivable, Interest Income, Accrual Method		0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral		9,052,000		9,052,000		2,270,000
Total Assets, Fair Value, Gross Asset		10,599,000		10,599,000		2,749,000
Total Assets, Fair Value, Gross Liability		0		0		0
Total Assets, Fair value, Amount Not Offset Against Collateral		10,599,000		10,599,000		2,749,000
Total Asset Netting Adjustment Per Applicable Master Netting Arrangements		1,547,000		1,547,000		479,000
Total Collateral, Obligation to Return Cash		0		0		0
Total Asset, Fair Value, Amount Offset Against Collateral		9,052,000		9,052,000		2,270,000
Derivative, Inception Date	Sep. 22, 2015
Derivative, Fixed Interest Rate	1.94%
Derivative Asset, Notional Amount		468,071,000		468,071,000		253,851,000
Interest Rate Derivative Assets, at Fair Value		10,599,000		10,599,000		2,749,000
Derivative Liability, Notional Amount	$ 100,000,000	420,809,000		420,809,000		153,593,000
Interest Rate Derivative Liabilities, at Fair Value		9,797,000		9,797,000		1,314,000
Derivative Liability, Fair Value, Gross Liability		9,797,000		9,797,000		1,314,000
Derivative Liability, Fair Value, Gross Asset		0		0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		9,797,000		9,797,000		1,314,000
Derivative Liability Netting Adjustment Per Applicable Master Netting Agreements		1,547,000		1,547,000		479,000
Derivative, Collateral, Right to Reclaim Cash		8,250,000		8,250,000		0
Derivative Liability, Fair Value, Amount Offset Against Collateral		0		0		835,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral		579,772,000		579,772,000		537,556,000
Securities Sold under Agreements to Repurchase, Gross		0		0		0
Securities Sold under Agreements to Repurchase, Not Offset, Policy Election Deduction		579,772,000		579,772,000		537,556,000
Securities Sold Under Agreement to Repurchase, Amount Not Offset Against Collateral		0		0		0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities		579,772,000		579,772,000		537,556,000
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral		0		0		0
Total Liabilities, Fair Value, Gross Amount		589,569,000		589,569,000		538,870,000
Total Liabilities, Fair Value, Gross Liability		0		0		0
Total Liabilities, Fair value, Amount Not Offset Against Collateral		589,569,000		589,569,000		538,870,000
Total Liabilities Netting Adjustment Per Applicable Master Netting Arrangements		1,547,000		1,547,000		479,000
Total Collateral, Obligation to Return Cash or Securities		588,022,000		588,022,000		537,556,000
Total Liabilities, Fair Value, Amount Offset Against Collateral		0		0		835,000
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net				372
Interest Rate Swap
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		9,001,000		9,001,000		1,332,000
Derivative Asset, Fair Value, Gross Liability		0		0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		9,001,000		9,001,000		1,332,000
Derivative Asset Netting Adjustment Per Applicable Master Netting Agreements		1,547,000		1,547,000		479,000
Impaired Financing Receivable, Interest Income, Accrual Method		0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral		7,454,000		7,454,000		853,000
Derivative Liability, Notional Amount		100,000,000		100,000,000
Mortgage Related Derivatives [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,598,000		1,598,000		1,417,000
Derivative Asset, Fair Value, Gross Liability		0		0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		1,598,000		1,598,000		1,417,000
Derivative Asset Netting Adjustment Per Applicable Master Netting Agreements		0		0		0
Impaired Financing Receivable, Interest Income, Accrual Method		0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral		1,598,000		1,598,000		1,417,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion		(486,000)	$ (804,000)	(437,000)	$ (3,002,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap
Derivative [Line Items]
Derivative Liability, Notional Amount		100,000,000		100,000,000		100,000,000
Interest Rate Derivative Liabilities, at Fair Value		470,000		470,000		33,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Loss on Derivative		70,000	(50,000)	31,000	(79,000)
Fee Income on Derivatives		321,000	245,000	279,000	245,000
Gain (Loss) on Fair Value Hedges Recognized in Earnings		290,000	$ 523,000	181,000	$ 1,218,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap
Derivative [Line Items]
Derivative Asset, Notional Amount		320,809,000		320,809,000		53,593,000
Interest Rate Derivative Assets, at Fair Value		9,001,000		9,001,000		1,332,000
Derivative Liability, Notional Amount		320,809,000		320,809,000		53,593,000
Interest Rate Derivative Liabilities, at Fair Value		9,327,000		9,327,000		1,281,000
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount		64,673,000		64,673,000		73,422,000
Interest Rate Derivative Assets, at Fair Value		1,301,000		1,301,000		1,131,000
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount		82,589,000		82,589,000		126,836,000
Interest Rate Derivative Assets, at Fair Value		$ 297,000		$ 297,000		$ 286,000