Loans (Loan Maturities) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	$ 245,955
Loan maturities, After 1 but within 5 Years	255,718
Loan maturities, After 5 Years	1,104,636
Loans due after one year with: Variable rates	412,278
Loans due after one year with: Fixed rates	948,076
Loans due after one year	1,360,354
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	85,136
Loan maturities, After 1 but within 5 Years	70,697
Loan maturities, After 5 Years	34,148
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	42,264
Loan maturities, After 1 but within 5 Years	91,826
Loan maturities, After 5 Years	601,014
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	48,112
Loan maturities, After 1 but within 5 Years	8,723
Loan maturities, After 5 Years	43,796
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	32,677
Loan maturities, After 1 but within 5 Years	56,346
Loan maturities, After 5 Years	411,373
Mortgage Warehouse Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	30,757
Loan maturities, After 1 but within 5 Years	0
Loan maturities, After 5 Years	0
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	6,303
Loan maturities, After 1 but within 5 Years	25,419
Loan maturities, After 5 Years	4,480
Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan maturities, Within 1 Year	706
Loan maturities, After 1 but within 5 Years	2,707
Loan maturities, After 5 Years	$ 9,825