Loans and Allowance for Credit Losses (Details 5) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans past due	$ 38,730	$ 31,082
Current loans	5,946,301	5,646,811
Total recorded investment in loans	5,985,031	5,677,893
Residential Portfolio Segment [Member]
Loans past due	1,315	1,733
Current loans	149,800	151,015
Total recorded investment in loans	151,115	152,748
Owner Occupied Portfolio Segment [Member]
Loans past due	12,645	9,408
Current loans	647,421	631,462
Total recorded investment in loans	660,066	640,870
Other Consumer Portfolio Segment [Member]
Loans past due	103	236
Current loans	2,631	10,129
Total recorded investment in loans	2,734	10,365
Income Producing Portfolio Segment [Member]
Loans past due	10,226	11,050
Current loans	2,586,004	2,498,467
Total recorded investment in loans	2,596,230	2,509,517
Home Equity Portfolio Segment [Member]
Loans past due	751
Current loans	102,920	105,096
Total recorded investment in loans	103,671	105,096
Construction Portfolio Segment [Member]
Loans past due	6,115	3,774
Current loans	1,145,364	1,054,795
Total recorded investment in loans	1,151,479	1,058,569
Commercial Portfolio Segment [Member]
Loans past due	7,575	4,881
Current loans	1,312,161	1,195,847
Total recorded investment in loans	1,319,736	1,200,728
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	11,185	7,608
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	1,011	1,015
Financing Receivables, 30 to 59 Days Past Due [Member] | Owner Occupied Portfolio Segment [Member]
Loans past due	2,080	3,987
Financing Receivables, 30 to 59 Days Past Due [Member] | Other Consumer Portfolio Segment [Member]
Loans past due	11	101
Financing Receivables, 30 to 59 Days Past Due [Member] | Income Producing Portfolio Segment [Member]
Loans past due	4,560	511
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity Portfolio Segment [Member]
Loans past due	157
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Portfolio Segment [Member]
Loans past due		360
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans past due	3,366	1,634
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	10,397	5,599
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due		163
Financing Receivables, 60 to 89 Days Past Due [Member] | Owner Occupied Portfolio Segment [Member]
Loans past due	5,195	3,328
Financing Receivables, 60 to 89 Days Past Due [Member] | Other Consumer Portfolio Segment [Member]
Loans past due		9
Financing Receivables, 60 to 89 Days Past Due [Member] | Income Producing Portfolio Segment [Member]
Loans past due	4,195
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Portfolio Segment [Member]
Loans past due		1,342
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans past due	1,007	757
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	17,148	17,875
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	304	555
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner Occupied Portfolio Segment [Member]
Loans past due	5,370	2,093
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Other Consumer Portfolio Segment [Member]
Loans past due	92	126
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Income Producing Portfolio Segment [Member]
Loans past due	1,471	10,539
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity Portfolio Segment [Member]
Loans past due	594
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Portfolio Segment [Member]
Loans past due	6,115	2,072
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans past due	$ 3,202	$ 2,490