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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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CET1 capital (to risk weighted aseets) minimum required for capital adequacy purposes |  | 5.75% | 5.125%
CET1 capital (to risk weighted aseets) to be well capitalized under prompt corrective action regulations | [1] | 6.50% | 6.50%
Total capital (to risk weighted assets) minimum required for capital adequacy purposes |  | 9.25% | 8.625%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations | [1] | 10.00% | 10.00%
Tier 1 capital (to risk weighted assets) minimum required for capital adequacy purposes |  | 7.25% | 6.625%
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations | [1] | 8.00% | 8.00%
Tier 1 capital (to average assets) minimum required for capital adequacy purposes |  | 5.00% | 5.00%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action regulations | [1] | 5.00% | 5.00%
Bank [Member] |  |  |
CET1 capital (to risk weighted aseets) actual amount |  | $ 969,250 | $ 854,226
CET1 capital (to risk weighted aseets) actual ratio |  | 12.91% | 12.55%
Total capital (to risk weighted assets) actual amount |  | $ 1,033,554 | $ 913,100
Total capital (to risk weighted assets) actual ratio |  | 13.76% | 13.41%
Tier 1 capital (to risk weighted assets) actual amount |  | $ 969,250 | $ 854,226
Tier 1 capital (to risk weighted assets) actual ratio |  | 12.91% | 12.55%
Tier 1 capital (to average assets) actual amount |  | $ 969,250 | $ 854,226
Tier 1 capital (to average assets) actual ratio |  | 13.15% | 12.44%
Parent Company [Member] |  |  |
CET1 capital (to risk weighted aseets) actual amount |  | $ 845,123 | $ 737,512
CET1 capital (to risk weighted aseets) actual ratio |  | 11.23% | 10.80%
Total capital (to risk weighted assets) actual amount |  | $ 1,129,954 | $ 1,016,712
Total capital (to risk weighted assets) actual ratio |  | 15.02% | 14.89%
Tier 1 capital (to risk weighted assets) actual amount |  | $ 845,123 | $ 737,512
Tier 1 capital (to risk weighted assets) actual ratio |  | 11.23% | 10.80%
Tier 1 capital (to average assets) actual amount |  | $ 845,123 | $ 737,512
Tier 1 capital (to average assets) actual ratio |  | 11.45% | 10.72%
[1] | Applies to Bank only

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- Definition The minimum CET1 risk based capital ratio (CET1 capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The CET1 risk based capital ratio (CET1 capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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