Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Amortized Cost	$ 788,181	$ 798,639
Gross Unrealized Gains	7,585	4,281
Gross Unrealized Losses	(5,172)	(8,275)
Fair Value	790,594	794,645
U.S. Treasury and U.S. Government-sponsored agencies
Investment Holdings [Line Items]
Amortized Cost	9,468	1,563
Gross Unrealized Gains	9	6
Gross Unrealized Losses	(29)	0
Fair Value	9,448	1,569
Municipal securities
Investment Holdings [Line Items]
Amortized Cost	239,881	237,305
Gross Unrealized Gains	5,313	2,427
Gross Unrealized Losses	(864)	(2,476)
Fair Value	244,330	237,256
Residential
Investment Holdings [Line Items]
Amortized Cost	282,997	310,391
Gross Unrealized Gains	851	985
Gross Unrealized Losses	(2,012)	(2,200)
Fair Value	281,836	309,176
Commercial
Investment Holdings [Line Items]
Amortized Cost	210,079	211,259
Gross Unrealized Gains	825	599
Gross Unrealized Losses	(2,245)	(3,540)
Fair Value	208,659	208,318
Collateralized loan obligations
Investment Holdings [Line Items]
Amortized Cost	6,798	10,505
Gross Unrealized Gains	14	4
Gross Unrealized Losses	(17)	(31)
Fair Value	6,795	10,478
Corporate obligations
Investment Holdings [Line Items]
Amortized Cost	13,552	16,611
Gross Unrealized Gains	213	104
Gross Unrealized Losses	0	(9)
Fair Value	13,765	16,706
Other securities
Investment Holdings [Line Items]
Amortized Cost	25,406	11,005
Gross Unrealized Gains	360	156
Gross Unrealized Losses	(5)	(19)
Fair Value	$ 25,761	$ 11,142

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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This item represents the cost of debt and equity 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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