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Loans and Allowance for Loan Losses - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Provision for Loan and Lease Losses | $ 15,871 | $ 6,150 | $ 7,150 |
Loans Receivable |  |  |  |
Provision for Loan and Lease Losses | 55,743 | 40,294 | 38,409 | $ 36,492
Financing Receivable, Credit Loss, Expense (Reversal) | 15,871 | 6,150 | 7,150 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (3,294) | (8,062) | (11,356) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 2,872 | 3,797 | 6,123 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 713 | 929 | 2,041 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 54,350 | 38,704 | 35,947 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 680 | 661 | 421 |
Financing Receivable, Individually Evaluated for Impairment | 9,048 | 10,267 | 13,939 |
Financing Receivable, Collectively Evaluated for Impairment | 5,117,838 | 4,914,573 | 4,811,661 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 98,643 | 127,206 | 167,651 |
Individually evaluated for impairment | 713 | 929 | 2,041 |
Collectively evaluated for impairment | 54,350 | 38,704 | 35,947 |
Individually evaluated for impairment | 9,048 | 10,267 | 13,939 |
Collectively evaluated for impairment | 5,117,838 | 4,914,573 | 4,811,661 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 98,643 | 127,206 | 167,651 |
Commercial Real Estate |  |  |  |
Provision for Loan and Lease Losses | 33,707 | 24,334 | 19,803 | 18,639
Financing Receivable, Credit Loss, Expense (Reversal) | 9,343 | 4,651 | 1,094 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (43) | (144) | (102) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 73 | 24 | 172 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 445 | 517 | 613 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 32,937 | 23,570 | 18,958 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 325 | 247 | 232 |
Financing Receivable, Individually Evaluated for Impairment | 3,438 | 4,020 | 3,501 |
Financing Receivable, Collectively Evaluated for Impairment | 1,550,239 | 1,490,152 | 1,367,934 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 24,613 | 29,158 | 33,620 |
Individually evaluated for impairment | 445 | 517 | 613 |
Collectively evaluated for impairment | 32,937 | 23,570 | 18,958 |
Individually evaluated for impairment | 3,438 | 4,020 | 3,501 |
Collectively evaluated for impairment | 1,550,239 | 1,490,152 | 1,367,934 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 24,613 | 29,158 | 33,620 |
Commercial construction |  |  |  |
Provision for Loan and Lease Losses | 3,521 | 3,076 | 3,105 | 1,767
Financing Receivable, Credit Loss, Expense (Reversal) | 242 | 22 | 1,031 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (1) | (101) | (87) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 204 | 50 | 394 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 3,378 | 2,940 | 3,029 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 143 | 136 | 76 |
Financing Receivable, Individually Evaluated for Impairment |  |  | 14 |
Financing Receivable, Collectively Evaluated for Impairment | 1,266,847 | 1,363,292 | 1,461,644 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 2,551 | 3,606 | 4,093 |
Collectively evaluated for impairment | 3,378 | 2,940 | 3,029 |
Individually evaluated for impairment |  |  | 14 |
Collectively evaluated for impairment | 1,266,847 | 1,363,292 | 1,461,644 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 2,551 | 3,606 | 4,093 |
One- to four-family residential construction |  |  |  |
Provision for Loan and Lease Losses | 4,536 | 4,339 | 3,122 | 2,108
Financing Receivable, Credit Loss, Expense (Reversal) | 84 | 1,625 | 742 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (70) | (534) | (62) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 183 | 126 | 334 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 90 | 198 | 694 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 4,382 | 3,973 | 2,392 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 64 | 168 | 36 |
Financing Receivable, Individually Evaluated for Impairment | 3,546 | 2,960 | 6,116 |
Financing Receivable, Collectively Evaluated for Impairment | 655,146 | 554,450 | 433,209 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 57,113 | 74,562 | 93,841 |
Individually evaluated for impairment | 90 | 198 | 694 |
Collectively evaluated for impairment | 4,382 | 3,973 | 2,392 |
Individually evaluated for impairment | 3,546 | 2,960 | 6,116 |
Collectively evaluated for impairment | 655,146 | 554,450 | 433,209 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 57,113 | 74,562 | 93,841 |
Other residential |  |  |  |
Provision for Loan and Lease Losses | 9,375 | 5,153 | 4,713 | 2,839
Financing Receivable, Credit Loss, Expense (Reversal) | 4,042 | 603 | 1,982 |
Financing Receivable, Allowance for Credit Loss, Writeoff |  | (189) | (525) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 180 | 26 | 417 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 9,282 | 5,101 | 4,681 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 93 | 52 | 32 |
Financing Receivable, Collectively Evaluated for Impairment | 1,021,145 | 866,006 | 784,894 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 6,150 | 5,334 | 12,790 |
Collectively evaluated for impairment | 9,282 | 5,101 | 4,681 |
Collectively evaluated for impairment | 1,021,145 | 866,006 | 784,894 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 6,150 | 5,334 | 12,790 |
Commercial business |  |  |  |
Provision for Loan and Lease Losses | 2,390 | 1,355 | 1,568 | 3,581
Financing Receivable, Credit Loss, Expense (Reversal) | 914 | (309) | (1,613) |
Financing Receivable, Allowance for Credit Loss, Writeoff | (28) | (371) | (1,155) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 149 | 467 | 755 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 14 | 13 | 309 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 2,331 | 1,306 | 1,247 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 45 | 36 | 12 |
Financing Receivable, Individually Evaluated for Impairment | 167 | 1,286 | 1,844 |
Financing Receivable, Collectively Evaluated for Impairment | 384,734 | 325,112 | 334,214 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 2,549 | 3,356 | 4,347 |
Individually evaluated for impairment | 14 | 13 | 309 |
Collectively evaluated for impairment | 2,331 | 1,306 | 1,247 |
Individually evaluated for impairment | 167 | 1,286 | 1,844 |
Collectively evaluated for impairment | 384,734 | 325,112 | 334,214 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 2,549 | 3,356 | 4,347 |
Consumer other |  |  |  |
Provision for Loan and Lease Losses | 2,214 | 2,037 | 6,098 | $ 7,558
Financing Receivable, Credit Loss, Expense (Reversal) | 1,246 | (442) | 3,914 |
Financing Receivable, Allowance for Credit Loss, Writeoff | (3,152) | (6,723) | (9,425) |
Accounts Receivable, Allowance for Credit Loss, Recovery | 2,083 | 3,104 | 4,051 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 164 | 201 | 425 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 2,040 | 1,814 | 5,640 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses | 10 | 22 | 33 |
Financing Receivable, Individually Evaluated for Impairment | 1,897 | 2,001 | 2,464 |
Financing Receivable, Collectively Evaluated for Impairment | 239,727 | 315,561 | 429,766 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | 5,667 | 11,190 | 18,960 |
Individually evaluated for impairment | 164 | 201 | 425 |
Collectively evaluated for impairment | 2,040 | 1,814 | 5,640 |
Individually evaluated for impairment | 1,897 | 2,001 | 2,464 |
Collectively evaluated for impairment | 239,727 | 315,561 | 429,766 |
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model | $ 5,667 | $ 11,190 | $ 18,960 |

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- Definition The carrying amount as of the balance sheet date of loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer, for which it was deemed probable at acquisition that the investor would be unable to collect all contractually required payments, and to which the income recognition total model was not applied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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