Loans and Credit Quality (Details 10) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross		$ 3,929,556
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	398,436	382,796
Purchased Credit Impaired Loans and Leases [Member] | Nonclassified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	189,614	221,060
Purchased Credit Impaired Loans and Leases [Member] | Classified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	208,822	161,736
Mortgage Loans on Real Estate [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	5,601,020	2,795,998
Loans and Leases Receivable, Net Amount		2,422,107
Mortgage Loans on Real Estate [Member] | Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	395,500	412,791
Loans and Leases Receivable, Net Amount	359,130	371,134
Mortgage Loans on Real Estate [Member] | Purchased Credit Impaired Loans and Leases [Member] | Nonclassified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	185,641	216,092
Mortgage Loans on Real Estate [Member] | Purchased Credit Impaired Loans and Leases [Member] | Classified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	173,489	155,042
Real Estate Construction [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	310,534	219,517
Loans and Leases Receivable, Net Amount		207,779
Real Estate Construction [Member] | Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	10,763	12,015
Loans and Leases Receivable, Net Amount	10,030	10,427
Real Estate Construction [Member] | Purchased Credit Impaired Loans and Leases [Member] | Nonclassified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	3,623	4,399
Real Estate Construction [Member] | Purchased Credit Impaired Loans and Leases [Member] | Classified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	6,407	6,028
Commercial Portfolio Segment [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	5,225,694	1,242,750
Loans and Leases Receivable, Net Amount		1,244,785
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	29,824	3,021
Loans and Leases Receivable, Net Amount	28,940	974
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member] | Nonclassified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	350	569
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member] | Classified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	28,590	405
Consumer Portfolio Segment [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	63,276	55,070
Loans and Leases Receivable, Net Amount		54,885
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	408	424
Loans and Leases Receivable, Net Amount	336	261
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member] | Nonclassified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	0	0
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans and Leases [Member] | Classified [Member]
Financing Receivable Recorded Investment By Credit Risk [Line Items]
Loans and Leases Receivable, Gross	$ 336	$ 261