Investment Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Total investment securities
Amortized Cost	$ 705,297	$ 394,227
Unrealized Gain	8,107	804
Unrealized Loss	(2,618)	(5,607)
Estimated Fair Value	710,786	389,424
Available for sale:
Total	697,547	385,662
Unrealized Gain	8,107	804
Unrealized Loss	(2,571)	(5,503)
Investment securities available-for-sale, at fair value	703,083	380,963
Held to maturity:
Amortized Cost	7,750	8,565
Unrealized Gain	0	0
Unrealized Loss	(47)	(104)
Estimated Fair Value	7,703	8,461
Agency
Available for sale:
Total	54,388
Unrealized Gain	707
Unrealized Loss	(24)
Investment securities available-for-sale, at fair value	55,071
Corporate
Available for sale:
Total	53,498	37,475
Unrealized Gain	1,001	372
Unrealized Loss	(150)	(205)
Investment securities available-for-sale, at fair value	54,349	37,642
Municipal bonds
Available for sale:
Total	247,242	120,155
Unrealized Gain	5,194	338
Unrealized Loss	(358)	(1,690)
Investment securities available-for-sale, at fair value	252,078	118,803
Collateralized mortgage obligation: residential
Available for sale:
Total	46,095	31,536
Unrealized Gain	312	25
Unrealized Loss	(86)	(173)
Investment securities available-for-sale, at fair value	46,321	31,388
Mortgage-backed securities
Available for sale:
Total	296,324	196,496
Unrealized Gain	893	69
Unrealized Loss	(1,953)	(3,435)
Investment securities available-for-sale, at fair value	295,264	193,130
Held to maturity:
Amortized Cost	6,586	7,375
Unrealized Gain	0	0
Unrealized Loss	(47)	(104)
Estimated Fair Value	6,539	7,271
Other
Held to maturity:
Amortized Cost	1,164	1,190
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	$ 1,164	$ 1,190

Available-For-Sale And Held-To-Maturity Securities [Abstract]

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Available-for-sale Securities And Held-To-Maturity Securities, Accumulated Gross Unrealized Gain, before Tax

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Available-for-sale Securities And Held-To-Maturity Securities, Accumulated Gross Unrealized Loss, before Tax

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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Fair value of investments in debt securities classified as held-to-maturity.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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