Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Costs to sell percentage	8.50%
Assets:
Securities available for sale, at fair value	$ 1,826,903	$ 1,846,265
Equity investments with readily determinable fair value	48,750	49,835
Mortgage banking derivatives	165
Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	844,899	895,122
Residential
Assets:
Securities available for sale, at fair value	367,176	402,605
Commercial
Assets:
Securities available for sale, at fair value	540,931	469,126
Corporate securities
Assets:
Securities available for sale, at fair value	3,880	3,826
Municipal securities
Assets:
Securities available for sale, at fair value	70,017	75,586
Recurring basis \| Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	844,899	895,122
Recurring basis \| Residential
Assets:
Securities available for sale, at fair value	367,176	402,605
Recurring basis \| Commercial
Assets:
Securities available for sale, at fair value	540,931	469,126
Recurring basis \| Corporate securities
Assets:
Securities available for sale, at fair value	3,880	3,826
Recurring basis \| Municipal securities
Assets:
Securities available for sale, at fair value	70,017	75,586
Recurring basis \| Equity investments
Assets:
Equity investments with readily determinable fair value	22,061
Recurring basis \| Equity investments with readily determinable fair value
Assets:
Securities available for sale, at fair value	23,405
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate swaps	0	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) \| Residential
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| 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) \| Equity investments
Assets:
Equity investments with readily determinable fair value	22,061
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Equity investments with readily determinable fair value
Assets:
Securities available for sale, at fair value	23,405
Recurring basis \| Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	9,060	7,059
Mortgage banking derivatives	165	10
Liabilities:
Interest rate swaps	9,060	7,059
Mortgage banking derivatives	96	3
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	844,899	895,122
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Residential
Assets:
Securities available for sale, at fair value	367,176	402,605
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Commercial
Assets:
Securities available for sale, at fair value	540,931	469,126
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Securities available for sale, at fair value	3,880	3,826
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Municipal securities
Assets:
Securities available for sale, at fair value	68,930	74,527
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Equity investments
Assets:
Equity investments with readily determinable fair value	0
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Equity investments with readily determinable fair value
Assets:
Securities available for sale, at fair value	0
Recurring basis \| Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	0	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) \| Residential
Assets:
Securities available for sale, at fair value	0	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Commercial
Assets:
Securities available for sale, at fair value	0	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	1,087	1,059
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Equity investments
Assets:
Equity investments with readily determinable fair value	0
Recurring basis \| Significant Unobservable Inputs (Level 3) \| Equity investments with readily determinable fair value
Assets:
Securities available for sale, at fair value	0
Recurring basis \| Estimated Fair Value
Assets:
Interest rate swaps	9,060	7,059
Mortgage banking derivatives		10
Liabilities:
Interest rate swaps	9,060	7,059
Mortgage banking derivatives	$ 96	$ 3
Discount Rate \| Accounts Receivable \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.20
Discount Rate \| Accounts Receivable \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.60
Discount Rate \| Inventories \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.50
Discount Rate \| Inventories \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.70

Commercial and Indsutrial and Asset-Backed Loans, Measurement Input

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Fair Value Inputs, Costs To Sell Percentage

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Mortgage Banking Derivative Assets, 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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