Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Costs to sell	8.50%
Assets:
Securities available for sale, at fair value	$ 1,846,265,000	$ 1,720,257,000
Transfers between levels 1, 2 and 3	0	0
Collateralized Mortgage Obligations
Assets:
Securities available for sale, at fair value	895,122,000	838,709,000
Mortgage-backed Securities, Residential
Assets:
Securities available for sale, at fair value	402,605,000	471,214,000
Mortgage-backed Securities, Commercial
Assets:
Securities available for sale, at fair value	469,126,000	301,365,000
Corporate securities
Assets:
Securities available for sale, at fair value	3,826,000	4,475,000
Municipal securities
Assets:
Securities available for sale, at fair value	75,586,000	82,537,000
Mutual funds
Assets:
Securities available for sale, at fair value		21,957,000
Recurring basis
Assets:
Interest rate swaps	7,059,000
Interest rate swaps		4,506,000
Mortgage banking derivatives	10,000	33,000
Liabilities:
Interest rate swaps	7,059,000	4,506,000
Mortgage banking derivatives	3,000	5,000
Recurring basis \| Collateralized Mortgage Obligations
Assets:
Securities available for sale, at fair value	895,122,000	838,709,000
Recurring basis \| Mortgage-backed Securities, Residential
Assets:
Securities available for sale, at fair value	402,605,000	471,214,000
Recurring basis \| Mortgage-backed Securities, Commercial
Assets:
Securities available for sale, at fair value	469,126,000	301,365,000
Recurring basis \| Corporate securities
Assets:
Securities available for sale, at fair value	3,826,000	4,475,000
Recurring basis \| Municipal securities
Assets:
Securities available for sale, at fair value	75,586,000	82,537,000
Recurring basis \| Mutual funds
Assets:
Securities available for sale, at fair value	23,405,000	21,957,000
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate swaps	0
Interest rate swaps		0
Mortgage banking derivatives	0	0
Liabilities:
Interest rate swaps	0	0
Mortgage banking derivatives	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Collateralized Mortgage Obligations
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mortgage-backed Securities, Residential
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mortgage-backed Securities, Commercial
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Municipal securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds
Assets:
Securities available for sale, at fair value	23,405,000	21,957,000
Recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	7,059,000
Interest rate swaps		4,506,000
Mortgage banking derivatives	10,000	33,000
Liabilities:
Interest rate swaps	7,059,000	4,506,000
Mortgage banking derivatives	3,000	5,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Collateralized Mortgage Obligations
Assets:
Securities available for sale, at fair value	895,122,000	838,709,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed Securities, Residential
Assets:
Securities available for sale, at fair value	402,605,000	471,214,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed Securities, Commercial
Assets:
Securities available for sale, at fair value	469,126,000	301,365,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Securities available for sale, at fair value	3,826,000	4,475,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Municipal securities
Assets:
Securities available for sale, at fair value	74,527,000	81,429,000
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Mutual funds
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	0
Interest rate swaps		0
Mortgage banking derivatives	0	0
Liabilities:
Interest rate swaps	0	0
Mortgage banking derivatives	0	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Collateralized Mortgage Obligations
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Mortgage-backed Securities, Residential
Assets:
Securities available for sale, at fair value	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Mortgage-backed Securities, Commercial
Assets:
Securities available for sale, at fair value	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Corporate securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Municipal securities
Assets:
Securities available for sale, at fair value	1,059,000	1,108,000
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Mutual funds
Assets:
Securities available for sale, at fair value	$ 0	$ 0
Accounts Receivable \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	20.00%
Accounts Receivable \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	60.00%
Inventories \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	50.00%
Inventories \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	70.00%

Fair Value Inputs, Costs To Sell Percentage

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Fair Value, Transfers Between Levels 1 through 3, Amount

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- Definition

Mortgage Banking Derivative Assets, at Fair Value

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Mortgage Banking Derivative Liabilities, at Fair Value

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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