Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 746,390	$ 658,458
Gross Unrealized Gains, Available for Sale	4,388	3,156
Gross Unrealized Losses, Available for Sale	(9,403)	(20,003)
Fair Value, Available for Sale	741,375	641,611
Gross Amortized Cost, Held for Investment Securities	207,904	0
Gross Unrealized Gains, Held for Investment Securities	1,507	0
Gross Unrealized Losses, Held for Investment Securities	(623)	0
Held for investment fair value	208,787	0
US Treasury Securities and obligations of US Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	3,876	100
Gross Unrealized Gains, Available for Sale	23	0
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	3,899	100
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	123,981	129,468
Gross Unrealized Gains, Available for Sale	1,501	1,456
Gross Unrealized Losses, Available for Sale	(423)	(4,189)
Fair Value, Available for Sale	125,059	126,735
Gross Amortized Cost, Held for Investment Securities	67,535	0
Gross Unrealized Gains, Held for Investment Securities	812	0
Gross Unrealized Losses, Held for Investment Securities	0	0
Held for investment fair value	68,347	0
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	352,483	383,392
Gross Unrealized Gains, Available for Sale	1,075	776
Gross Unrealized Losses, Available for Sale	(6,077)	(14,747)
Fair Value, Available for Sale	347,481	369,421
Gross Amortized Cost, Held for Investment Securities	114,541	0
Gross Unrealized Gains, Held for Investment Securities	695	0
Gross Unrealized Losses, Held for Investment Securities	(280)	0
Held for investment fair value	114,956	0
Private mortgage backed securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	29,967	29,800
Gross Unrealized Gains, Available for Sale	291	0
Gross Unrealized Losses, Available for Sale	0	(226)
Fair Value, Available for Sale	30,258	29,574
Gross Amortized Cost, Held for Investment Securities	0
Private collateralized mortgage obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	85,175	76,520
Gross Unrealized Gains, Available for Sale	688	731
Gross Unrealized Losses, Available for Sale	(728)	(413)
Fair Value, Available for Sale	85,135	76,838
Gross Amortized Cost, Held for Investment Securities	25,828
Private collateralized loan obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	127,397	32,592
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(2,172)	(413)
Fair Value, Available for Sale	125,225	32,179
Gross Amortized Cost, Held for Investment Securities	25,828	0
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(343)	0
Held for investment fair value	25,485	0
Obligations of state and political subdivisions [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	23,511	6,586
Gross Unrealized Gains, Available for Sale	810	193
Gross Unrealized Losses, Available for Sale	(3)	(15)
Fair Value, Available for Sale	$ 24,318	$ 6,764

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 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 of debt securities categorized neither as held-to-maturity nor trading.

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

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

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

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