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Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive income | $ 1,158,111 | $ 1,183,261 | $ 1,268,748 | $ 991,201 | $ 989,273 | $ 1,057,181
Net Unrealized Loss on Securities Available for Sale [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax | (2,686) |  | (4,321) |  |  |
Tax effect | 773 |  | 1,159 |  |  |
Total accumulated other comprehensive income | (1,913) |  | (3,162) |  |  |
Net Unrealized Loss on Securities Transferred from Available for Sale to Held to Maturity [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax | (666) |  | (887) |  |  |
Tax effect | 196 |  | 249 |  |  |
Total accumulated other comprehensive income | (470) |  | (638) |  |  |
Fair Value Adjustments on Derivatives [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax | 14,968 |  | 31,881 |  |  |
Tax effect | (4,414) |  | (8,961) |  |  |
Total accumulated other comprehensive income | 10,554 |  | 22,920 |  |  |
Benefit Plan Adjustments [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income, before tax | (839) |  | (813) |  |  |
Tax effect | 247 |  | 228 |  |  |
Total accumulated other comprehensive income | (592) |  | (585) |  |  |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive income | $ 7,579 | $ 8,802 | $ 18,535 | $ 15,174 | $ 6,412 | $ 1,044

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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