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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | $ 32,850 | $ 29,084 | $ 62,708 | $ 56,423
Total noninterest income out-of-scope of ASC 606 | 1,308 | 1,220 | 2,727 | 2,631
Total noninterest income | 34,158 | 30,304 | 65,435 | 59,054
Insurance and Other Financial Services Revenue [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | 5,826 | 5,621 | 12,330 | 12,391
Service Charges on Deposit Accounts [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | 4,246 | 4,161 | 8,218 | 8,138
ATM and Debit Card Fees [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | 5,816 | 5,518 | 11,089 | 10,468
Retirement Plan Administration Fees [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | 7,296 | 5,437 | 12,635 | 9,609
Trust [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | 5,265 | 5,161 | 10,143 | 9,693
Other [Member] |  |  |  |
Noninterest Income [Abstract] |  |  |  |
Total noninterest income in-scope of ASC 606 | $ 4,401 | $ 3,186 | $ 8,293 | $ 6,124

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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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