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Bank segment - Balance sheet data (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets |  |  |  |
Available-for-sale investment securities, at fair value | $ 1,348,263 | $ 1,388,533 |  |
Held-to-maturity investment securities, at amortized cost | 140,203 | 141,875 |  |
Stock in Federal Home Loan Bank, at cost | 9,434 | 9,958 |  |
Allowance for loan losses | (54,297) | (52,119) |  |
Net loans | 4,803,883 | 4,790,902 |  |
Loans held for sale, at lower of cost or fair value | 8,136 | 1,805 |  |
Other | 581,350 | 530,364 |  |
Goodwill | 82,190 | 82,190 |  |
Total assets | 13,360,105 | 13,104,051 |  |
Liabilities |  |  |  |
Other | 518,792 | 580,788 |  |
Total liabilities | 11,142,297 | 10,907,478 |  |
Commitments and contingencies |  |  |  |
Retained earnings | 554,451 | 543,623 |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (41,369) | (50,610) |  |
Total shareholders’ equity | 2,183,515 | 2,162,280 | $ 2,091,777 | $ 2,097,386
Total liabilities and shareholders’ equity | 13,360,105 | 13,104,051 |  |
Other assets |  |  |  |
Premises and equipment, net | 4,867,127 | 4,830,118 |  |
Other | 581,350 | 530,364 |  |
Other liabilities |  |  |  |
Total other liabilities | 518,792 | 580,788 |  |
Balance Sheet related disclosures |  |  |  |
Held-to-maturity investment securities | 142,333 | 142,057 |  |
Securities sold under agreements to repurchase | 65,000 | 65,000 |  |
American Savings Bank (ASB) |  |  |  |
Assets |  |  |  |
Cash and due from banks | 136,585 | 122,059 |  |
Interest-bearing deposits | 31,703 | 4,225 |  |
Available-for-sale investment securities, at fair value | 1,348,263 | 1,388,533 |  |
Held-to-maturity investment securities, at amortized cost | 140,203 | 141,875 |  |
Stock in Federal Home Loan Bank, at cost | 9,434 | 9,958 |  |
Loans held for investment | 4,858,180 | 4,843,021 |  |
Allowance for loan losses | (54,297) | (52,119) |  |
Net loans | 4,803,883 | 4,790,902 |  |
Loans held for sale, at lower of cost or fair value | 8,136 | 1,805 |  |
Other | 501,970 | 486,347 |  |
Goodwill | 82,190 | 82,190 |  |
Total assets | 7,062,367 | 7,027,894 |  |
Liabilities |  |  |  |
Deposit liabilities—noninterest-bearing | 1,879,244 | 1,800,727 |  |
Deposit liabilities—interest-bearing | 4,326,415 | 4,358,125 |  |
Other borrowings | 89,870 | 110,040 |  |
Other | 122,651 | 124,613 |  |
Total liabilities | 6,418,180 | 6,393,505 |  |
Commitments and contingencies |  |  |  |
Common stock | 1 | 1 |  |
Additional paid-in capital | 347,877 | 347,170 |  |
Retained earnings | 328,125 | 325,286 |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |
Net unrealized losses on securities | (14,984) | (24,423) |  |
Retirement benefit plans | (16,832) | (13,645) |  |
Accumulated other comprehensive loss, net of tax benefits | (31,816) | (38,068) |  |
Total shareholders’ equity | 644,187 | 634,389 |  |
Total liabilities and shareholders’ equity | 7,062,367 | 7,027,894 |  |
Other assets |  |  |  |
Bank-owned life insurance | 150,705 | 151,172 |  |
Premises and equipment, net | 208,309 | 214,415 |  |
Accrued interest receivable | 20,654 | 20,140 |  |
Mortgage-servicing rights | 7,897 | 8,062 |  |
Low-income housing equity investments | 65,428 | 67,626 |  |
Real estate acquired in settlement of loans, net | 0 | 406 |  |
Real estate held for sale | 9,014 | 0 |  |
Other | 39,963 | 24,526 |  |
Other | 501,970 | 486,347 |  |
Other liabilities |  |  |  |
Accrued expenses | 36,067 | 54,084 |  |
Federal and state income taxes payable | 5,391 | 2,012 |  |
Cashier’s checks | 27,432 | 26,906 |  |
Advance payments by borrowers | 5,956 | 10,183 |  |
Other | 47,805 | 31,428 |  |
Total other liabilities | 122,651 | 124,613 |  |
Balance Sheet related disclosures |  |  |  |
Held-to-maturity investment securities | 142,333 | 142,057 |  |
Securities sold under agreements to repurchase | 65,000 | 65,000 |  |
Advances from Federal Home Loan Bank | $ 25,000 | $ 45,000 |  |

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- Definition The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. This amount is adjusted for regulatory rate making impacts. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(24)) -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 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 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(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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- Definition Carrying amount of accumulated prepayments received by financial institutions from borrowers for taxes (for example, property taxes) and insurance (for example, property and catastrophe) which will periodically be remitted to the appropriate governmental agency or vendor on behalf of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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