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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Part III (PCI Loans) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Sep. 08, 2016
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Carrying Amount [Abstract] |  |  |  |
Carrying amount, net of allowance | $ 1,955,617,000 | $ 1,918,499,000 |  |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Carrying Amount [Abstract] |  |  |  |
Carrying amount | 253,000 | 259,000 | $ 7,968,000 |
Allowance for loan losses | 5,000 | 9,000 | $ 25,000 |
Carrying amount, net of allowance | 248,000 | 250,000 |  |
Contractual Payments at Acquisition [Abstract] |  |  |  |
Contractually required payments |  |  |  | $ 10,650,000
Fair value of acquired loans at acquisition |  |  |  | $ 8,688,000
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Carrying Amount [Abstract] |  |  |  |
Carrying amount | 249,000 | 251,000 |  |
Commercial and industrial loans | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Carrying Amount [Abstract] |  |  |  |
Carrying amount | $ 4,000 | $ 8,000 |  |

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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